C# Object Oriented Software

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Browse free open source C# Object Oriented Software and projects below. Use the toggles on the left to filter open source C# Object Oriented Software by OS, license, language, programming language, and project status.

  • MongoDB Atlas runs apps anywhere Icon
    MongoDB Atlas runs apps anywhere

    Deploy in 115+ regions with the modern database for every enterprise.

    MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
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    Custom VMs From 1 to 96 vCPUs With 99.95% Uptime

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  • 1
    Castle aspires to simplify the development of enterprise and web applications. Offering a set of tools (working together or indepedently) and integration with other open source projects, Castle helps you get more done with less code.
    Downloads: 52 This Week
    Last Update:
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  • 2
    SMC - The State Machine Compiler

    SMC - The State Machine Compiler

    Translates state machine into a target programming language.

    SMC takes a state machine stored in a .sm file and generates a State pattern in 14 programming languages. Includes: default transitions, transition args, transition guards, push/pop transitions and Entry/Exit actions. See User Manual for more info.
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    Downloads: 56 This Week
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  • 3
    db4o is the world's leading open source object database for Java and .NET. Leverage fast native object persistence, ACID transactions, query-by-example, S.O.D.A object query API, automatic class schema evolution, small size (http://developer.db4o.com)
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    Downloads: 48 This Week
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  • 4
    FileHelpers Library
    http://www.filehelpers.net The FileHelpers are an easy to use .NET library written in C#. Is designed to read/write data from flat files with fixed length or delimited records (CSV). Also has support to import/export data from different data storages (Excel, Access, SqlServer) Code on GitHub: https://github.com/MarcosMeli/FileHelpers
    Downloads: 39 This Week
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  • Ship Agents Faster Icon
    Ship Agents Faster

    Transform your applications and workflows into powerful agentic systems at global scale.

    Gemini Enterprise Agent Platform lets you rapidly build, scale, govern and optimize production-ready agents grounded in your organization's data. The platform enables developers to build custom or pre-built agents for virtually any use case. New customers get $300 in free credits.
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  • 5
    Outdated: New version can be found here...https://github.com/bernharde/hexbox Be.HexEditor is a small, fast and simple hex editor. It contains a reusable hex edit control called HexBox. This C# control is reusable for every .NET Framework application.
    Downloads: 21 This Week
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  • 6
    STD Foundation Classes

    STD Foundation Classes

    Object oriented frameworks - PowerBuilder, PowerServer & InfoMaker!

    by Chris Pollach (http://chrispollach.blogspot.ca) A fully integrated "object oriented" set of PB Classes for the following products: PowerBuilder, PowerClient & PowerServer. The framework greatly enhances the development process by making the PowerBuilder developer significantly more productive! License: https://sourceforge.net/projects/stdfndclass/files/License (Open Source) => Updated version of the STD "Integrated" framework 2026R1 build 2026.1.0.467 was released to production on 2026-01-09. https://sourceforge.net/projects/stdfndclass/files/FrameWork/Integrated => The STD Framework "Example Apps" 2026 R1 latest builds https://chrispollach.blogspot.com/2026/03/updated.html => Updated version of the STD "Order Entry" example App 2025R2 build 2026.1.0.647 was released on 2026-04-08. https://sourceforge.net/projects/stdfndclass/files/Applications/PowerBuilder/OrderEntry
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    Downloads: 54 This Week
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  • 7
    NArrange is a tool for arranging .NET source code. This code beautifier automatically sorts and organizes class members into groups or regions. C# and VB.NET code files are supported, but one goal will be to add support for additional .NET languages.
    Downloads: 5 This Week
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  • 8

    ClassStudio

    A code generator. Compile C# code from and to different languages.

    Downloads: 9 This Week
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  • 9
    A core framework based on .net technology to provide extended functionalities upon the standard .net framework. - Generic ORM engine (based on Emit) - High performance Cache impl - Lite Reflection.Emit framework - Collection Framework (proposed)
    Downloads: 8 This Week
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  • Train ML Models With SQL You Already Know Icon
    Train ML Models With SQL You Already Know

    BigQuery automates data prep, analysis, and predictions with built-in AI assistance.

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  • 10
    Space3d

    Space3d

    C# graphics library used for 3D modeling, built with OpenGL/OpenTK

    The Graphics Library is built on top of OpenTK, the C# library that wraps OpenGL. The intended clients are technical and engineering graphics applications that require three-dimensional visualization tool. The implementation draws a scene on separate working thread, optionally, the thread-updater may be invoked. The Space3d Library uses Recursive Composition design pattern. The hierarchy by reference, built into the component, plays a dual role in modeling three-dimensional space: first, it provides a control over a lifetime of the object cluster; second, it mirrors a subordination of the object coordinate systems. The project libraries are built with Visual Studio, using .NET Framework 4.7.1. To test the graphics capabilities, compile and run the GraphicsTest solution. To test the Space3d Library, compile and run the Space3dTest solution.
    Downloads: 4 This Week
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  • 11
    Endless Space Mod Tool

    Endless Space Mod Tool

    An Endless Space Mod Tool for the modding community.

    An Endless Space Mod Tool for the modding community. We made this tool ourselves using only the mods in circulation as a base to read, edit and create mods. (There is little functionality at the moment) Translators are still needed for other languages to support so if you want to help with translating feel free to give us a call.
    Downloads: 6 This Week
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  • 12
    A full featured, object-oriented, multi-platform C# wrapper for the curses terminal control library.
    Downloads: 2 This Week
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  • 13
    A .Net library to handle conversions from and to JSON (JavaScript Object Notation) strings. Written in C# 2.0 and compatible with all .Net languages.
    Downloads: 2 This Week
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  • 14
    BizBlox is a simple to use Object Relational Mapper API for .Net. On top of the usual features you expect from an ORM it provides native support for web services using transfer objects and partial transfer objects.
    Downloads: 4 This Week
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  • 15
    This code is another way to create SOA applications through HTTP. Can execute Database SPs, MSMQ, Assemblies, IronPython script and generates RSS, JSON, Web Service, Text or Excel file through HTTP. The system has authentication and logging support.
    Downloads: 4 This Week
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  • 16
    AODL,a C# .net library for creating / editing documents in the OpenDocument Format ( ODF ). Requires no knowledge about the ODF XML schema itself. AODC, an OpenDocument Converter & Embed OpenOffice as .net Control
    Downloads: 2 This Week
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  • 17
    The project implement a framework of modular compilers that allows compile time programming for .NET, Java and other platforms. Languages on this framework are multi-paradigm and can be extended by programming new semantic structures or DSL.
    Downloads: 2 This Week
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  • 18
    Intel® Mobile Platform SDK 1.3 covered by BSD license, enables developers to build mobile-aware applications. It provides a set of libraries and runtime components, and programming interface, common across Windows and Linux platforms.
    Downloads: 3 This Week
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  • 19
    A data abstraction layer for .net applications. Write your application code to be database neutral. Swap out the type of database your application uses without updating or even recompiling your business components.
    Downloads: 3 This Week
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  • 20
    Class library to provide algorithmic functionality to collections. Some of the algorithms are: ForEach, Find, FindAll, Collect, etc.
    Downloads: 2 This Week
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  • 21
    EIDNative Library is a freeware SDK for Belgian Electronic ID Card. EIDNative Library includes native API for: * Microsoft .NET * Native Win32 * Visual Basic 6.0 and VBA * Java (only Windows platform)
    Downloads: 2 This Week
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  • 22
    FAMOUSO is an event-based publish/subscribe middleware written in C++ for systems ranging from 8Bit micro-controllers up to 32Bit PC/Workstations.
    Downloads: 2 This Week
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  • 23
    Fides is an extensible enterprise library for .NET 2.0 upwards and Java, containing a Object Relational Mapping framework and geared for simplicity and productivity.
    Downloads: 2 This Week
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  • 24
    A framework that provides AJAX technologies for web pages created with ASP.NET. It allows developers to easily integrate AJAX support into their pages without replacing the ASP.NET controls and/or writing javascript code.
    Downloads: 2 This Week
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  • 25

    Math Tools

    Provides useful mathematical tools which make your work much easier.

    Math Tools provides mathematical tools, allows you to calculate triangle propeties, and find both parametric and algebraic forms of planes. ------ More Tools Will be Added in The Future ------ ------ Translation to english will be completed soon ------
    Downloads: 2 This Week
    Last Update:
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