45 projects for "open source invoice" with 2 filters applied:

  • Our Free Plans just got better! | Auth0 Icon
    Our Free Plans just got better! | Auth0

    With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

    You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
    Try free now
  • Context for your AI agents Icon
    Context for your AI agents

    Crawl websites, sync to vector databases, and power RAG applications. Pre-built integrations for LLM pipelines and AI assistants.

    Build data pipelines that feed your AI models and agents without managing infrastructure. Crawl any website, transform content, and push directly to your preferred vector store. Use 10,000+ tools for RAG applications, AI assistants, and real-time knowledge bases. Monitor site changes, trigger workflows on new data, and keep your AIs fed with fresh, structured information. Cloud-native, API-first, and free to start until you need to scale.
    Try for free
  • 1
    Python

    Python

    The Python programming language

    ...It supports multiple programming paradigms including procedural, object-oriented, and functional styles. CPython, the reference implementation, is developed and maintained by the Python Software Foundation and the global open-source community. The language includes a vast standard library that accelerates development by providing built-in modules for file handling, networking, data manipulation, and more. Python runs seamlessly across platforms such as Linux, macOS, and Windows, making it ideal for both development and production environments. With constant updates, optimizations, and an active community, Python continues to be one of the most widely adopted languages worldwide.
    Downloads: 29 This Week
    Last Update:
    See Project
  • 2
    Starlark in Go

    Starlark in Go

    Starlark in Go: the Starlark configuration language, implemented in Go

    starlark-go is the official Go implementation of the Starlark programming language, a Python-like, dynamically typed configuration and scripting language originally developed for the Bazel build system. Starlark combines Python’s expressiveness and readability with deterministic execution, making it ideal for defining build configurations, scripting automation, and embedding domain-specific logic in applications. The Go-based interpreter allows developers to run or embed Starlark programs...
    Downloads: 6 This Week
    Last Update:
    See Project
  • 3
    Mangle

    Mangle

    Go library for Datalog-style logical reasoning and domain modeling

    Mangle is a programming language developed by Google for deductive database programming, serving as an advanced extension of Datalog. It is designed to unify and query data from multiple sources in a structured, declarative way while allowing developers to model complex relationships and domain knowledge beyond binary predicates. Mangle enhances traditional Datalog by introducing features such as aggregation, function calls, and optional type-checking, which make it more practical for modern...
    Downloads: 1 This Week
    Last Update:
    See Project
  • 4
    PLT (Programming Languages Theory)

    PLT (Programming Languages Theory)

    Programming Language Theory

    Curated roadmap to Programming Language Theory, collecting seminal papers, books, and resources into a navigable structure for self-study. It spans foundational topics like lambda calculus, type systems, interpreters, compilers, and formal semantics, while also pointing to contemporary areas such as effect systems, dependent types, and verification. Each section clusters materials by theme so learners can build understanding step by step instead of grazing at random. The list emphasizes...
    Downloads: 0 This Week
    Last Update:
    See Project
  • Payments you can rely on to run smarter. Icon
    Payments you can rely on to run smarter.

    Never miss a sale. Square payment processing serves customers better with tools and integrations that make work more efficient.

    Accept payments at your counter or on the go. It’s easy to get started. Try the Square POS app on your phone or pick from a range of hardworking hardware.
    Learn More
  • 5
    CLIPS Rule Based Programming Language
    CLIPS is a forward-chaining rule-based programming language written in C that also provides procedural and object-oriented programming facilities.
    Leader badge
    Downloads: 464 This Week
    Last Update:
    See Project
  • 6
    Agena

    Agena

    Agena is an interpreted procedural programming language.

    Agena is an easy-to-learn procedural programming language designed for science, scripting, and many other applications. Binaries are available for Windows, Linux, Solaris, OS/2, Mac OS X, Raspberry Pi and DOS.
    Leader badge
    Downloads: 206 This Week
    Last Update:
    See Project
  • 7
    Wikibook Ada Programming
    The Demonstrations Programs for the Wikibook "Ada Programming".
    Downloads: 16 This Week
    Last Update:
    See Project
  • 8
    Ficl - small systems scripting with OO
    Ficl is a lightweight, embeddable scripting language designed to be incorporated into other programs, including memory constrained embedded systems. Written in Standard C, Ficl conforms to the 1994 ANSI Standard for Forth, and provides several useful extensions including object oriented programming that can wrap compiled code and hardware interfaces. Unlike Lua or Python, Ficl acts as a component of your system - you feed it stuff to do, it does the stuff, and comes back to you for...
    Leader badge
    Downloads: 13 This Week
    Last Update:
    See Project
  • 9
    Spindle

    Spindle

    The language used in the AP CSP Exam, now a programming language!

    Spindle is a simple language designed to help AP CSP students ace their AP Exam. Spindle code largely mirrors the code found in the AP CSP Reference Sheet and allows students and teachers to get comfortable with code in the same format it'll have on exam day.
    Downloads: 1 This Week
    Last Update:
    See Project
  • AestheticsPro Medical Spa Software Icon
    AestheticsPro Medical Spa Software

    Our new software release will dramatically improve your medspa business performance while enhancing the customer experience

    AestheticsPro is the most complete Aesthetics Software on the market today. HIPAA Cloud Compliant with electronic charting, integrated POS, targeted marketing and results driven reporting; AestheticsPro delivers the tools you need to manage your medical spa business. It is our mission To Provide an All-in-One Cutting Edge Software to the Aesthetics Industry.
    Learn More
  • 10

    NetRexx

    The open sourced NetRexx reference implementation

    NetRexx is a dialect of the REXX programming language to run on the Java virtual machine. It supports a classic REXX syntax, with no reserved keywords, along with considerable additions to support object-oriented programming in a manner compatible with Java's object model, yet can be used as both a compiled and an interpreted language, with an option of using only data types native to the JVM or the NetRexx runtime package. Originally from IBM, NetRexx is the creation of Mike Cowlishaw, the...
    Downloads: 1 This Week
    Last Update:
    See Project
  • 11
    AQ

    AQ

    AQ is an interpreted programming language. It is fast, small, simple a

    AQ is a fast, small, simple and safe interpreted programming language. It may be a great work.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12

    Xi Programming Language

    A general-purpose, mutliparadigm language.

    Xi is a programming language which attempts to play a similar role to languages such as C, C++, or D. It is initially designed to leverage the procedural and object-oriented paradigms. It aims to provide an expressive language based off of a simple, LL(1) grammar with a comprehensive class library.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13
    Ring

    Ring

    Simple and flexible programming language for applications development

    ...The language is portable (MS-DOS, Windows, Linux, macOS, Android, WebAssembly, Microcontrollers, etc.) and can be used to create Console, GUI, Web, Games and Mobile applications. The language is designed to be simple, small and flexible. Ring is distributed as a Free-Open Source project under the MIT License.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 14
    ALCHA

    ALCHA

    A New Programming Language for FPGA Projects

    ALCHA aims to reduce FPGA project develop time by means of automation and abstraction, but without loosing the low-level control that HDLs, such as Verilog, provides. It will support an object oriented programming model, abstract data and signal types, and compile-time scripting.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    Erlava

    Erlava

    Hobby programming language for application development

    Erlava is a hobby programming language focusing on building applications fast and easily while still intergrating with the JVM. Erlava aims to provide developers with a versatile and efficient tool for crafting high-quality software.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16

    M.O.R.T.A.L.

    The M.O.R.T.A.L. programming language

    M.O.R.T.A.L. is a new general-purpose programming language now under development. It is meant to take the best features of multiple paradigms and combine them all into a single, easy-to-use language, suitable for professionals and hobbyists alike. (The basic OOP paradigm, with metaprogramming features, will be implemented first.) Its primary goal is to allow very heavy computations to be performed efficiently and easily, even by scientists from other fields than computer science. For...
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    PascalBoost
    Optimising Pascal code : - Setting const to parameters (not events) - Setting inc et dec on integer auto set - Setting with adding verifying methods and variable inside its begin end - Optionnal Setting strings into resourcestring
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    AL-IV

    AL-IV

    ALFOUR Programming language. Simple, safe, power, multi-platform.

    A programming language AL-IV (ALFOUR) is a high-level imperative object oriented programming language with minimal introduction level, easy porting to any platform claiming a very high level of safety and stability, with a controllable level of code protection, high efficiency of an executable code, full independence from a target platform, minimal enter level.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    SNOBOL4, while known primarily as a string language excels at any task involving symbolic manipulations. It provides run time typing, garbage collection, user data types, on the fly compilation.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 20
    PyConda

    PyConda

    PyConda is a simple, Python-based programming language.

    PyConda is a simple, Python-based programming language designed for ease of use and extensibility. With PyConda, you can write and execute code in a straightforward and intuitive manner.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    Jason is a fully-fledged interpreter for an extended version of AgentSpeak, a BDI agent-oriented logic programming language, and is implemented in Java. Using JADE a multi-agent system can be distributed over a network effortlessly. This project was moved to https://jason-lang.github.io
    Downloads: 11 This Week
    Last Update:
    See Project
  • 22
    XL (eXtensible Language) is a general purpose compiled programming language. XL doesn't force you to use a limited set of concepts (such as "objects"). Instead, it can be extended (through libraries) to use the concepts that are natural to your a
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    OK

    OK

    Welcome to the future of programming languages

    OK? is a modern, dynamically typed programming language created with a strong opinion: to remove needless complexity and help programmers write code that matters. It eliminates many common language features (e.g., ternary operators) in favour of a consistent, minimal syntax: for example it uses only switch statements for control flow and has only one comparison operator. OK? also treats errors as plain values (strings/arrays) and removes inheritance in favour of what it calls “evolution over...
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    Squirrel is a light weight programming language featuring higher-order functions,classes/inheritance,delegation,tail recursion,generators,cooperative threads,exception handling, reference counting and garbage collection on demand. C-like syntax.
    Leader badge
    Downloads: 37 This Week
    Last Update:
    See Project
  • 25
    newRPL

    newRPL

    The classic RPL programming language reimplemented and reimagined.

    This project reimplements from scratch the RPL language made popular by HP programmable calculators, in portable C/C++. The main goal is to release a complete computing environment for various targets. There's currently 4 active targets: the HP 50g, HP39gs and HP40gs calculators and a PC simulator (see the downloads section!). Other ports are planned for the future.
    Downloads: 26 This Week
    Last Update:
    See Project
  • Previous
  • You're on page 1
  • 2
  • Next