Open Source C# Database Engines/Servers

Firebird RDBMS offers ANSI SQL features & runs on Linux, Windows & several Unix platforms. Features excellent concurrency & performance & powerful stored procedure & trigger language. More information and downloads at https://firebirdsql.org/, issue tracker is https://github.com/FirebirdSQL/firebird/issues

NeoDatis ODB is a new generation Object Oriented Database. ODB is a real native and transparent persistence layer for Java, .Net, Groovy, Scala and Google Android. ODB is very simple and very fast and comes with a powerful query language.

Bitwarden Server is an open source project that contains all of the core infrastructure backend of all Bitwarden client applications. This includes APIs, database, Docker and other infrastructure items. Bitwarden is an open source password management solution that stores sensitive information in an encrypted vault. This project is written in C# using .NET Core with ASP.NET Core, while the database is written in T-SQL/SQL Server. Cross-platform, its codebase can be developed, built, run and deployed via Docker containers on Windows, macOS, and Linux distributions.

SQLite.org took over this project in 2010

Duplicati is a free and open source backup client for securely storing your data. Duplicati stores encrypted, incremental, compressed backups on cloud storage services and remote file servers using AES-256 encryption, keeping your data safe and always updated. It works with most storage services, including Google Cloud and Drive, Amazon S3, Microsoft Azure and OneDrive, Dropbox, FTPOpenStack Storage (Swift), SSH (SFTP), WebDAV, Tencent Cloud Object Storage (COS), and more! Duplicati also works on all major platforms (Windows, Linux and OSX). Unlike many other backup solutions, Duplicati ensures that your data is stored securely far away and updated regularly. Incremental updates means it saves on bandwidth and storage space, with a scheduler that automatically keeps your backups up to date.

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)

A free simple ADO.NET compliant MySQL driver. Made in C# but it would be used in all .NET compatible languages.

OpenVista(R) is the open-source version of VistA, an enterprise grade health care information system developed by the U.S. Veterans Affairs and deployed at 1,500 global facilities. OpenVista is a registered trademark of Medsphere Systems Corporation

Object-Relational Main-Memory Embedded Database system tightly integrated with C++ language. Use OS virtual mapping mechanism to access data. Provides subset of SQL language with OO extensions. Support of transactions, fault tolerance, replication.

A federated search application for discovering interesting files that are being shared online, such as video, music, books, software, games, subtitles and much more. All data is crawled by od-database which collects information about the contents of servers worldwide. We don't search file contents. We host no content, we provide only access to already available files in the same way Google and other search engines do.

Provides a .NET 2.0 interface for the Berkeley DB database engine. Written in C#, but accessible to other CLS-compliant languages as well.

COMBuilder is a VB6 app that will allow you to write all COM objects for working with databases. Also, the program will create forms to work with this objects. It is planned to create also c# and vb.net code.

A customizable tool for version-aware deployment/upgrade of database schemas. It can be used with any DBMS.

This project is made to run auto or manual scans that return your Routers IP Address. This is intended for persons who host their website on a dynamic IP address that gets changed by their ISP periodically.

Jaguar is highly loaded, distributed and easily scalable search engine. Main parts: NoSQL database server, Сommunication Queue server, multi-threaded Scanner and Analyzer services, Management tool.

SQL Server instance monitoring. A free professional monitoring application for SQL Server instance with historical data of : - CPU - logical read - physical read - write - SQL Queries - Wait Time - Signal wait - 1 user configurable list of waits - and 1 SQL Query preconfigured with number of users sessions Based on capture at configurable interval (2 secondes by default) of sys.sysprocesses, sys.dm_exec_requests, sys.dm_exec_sessions, sys.dm_os_wait_stats and sys.dm_exec_query_stats. Added new network protection anti-intrusion system, after a number of trying to connect via RDP or SQL the IP is BL in the FW Added new auto update Windows application Added new analysis of IP traffic (should not stay on as it's consuming some network band) No installation needed, it’s a simple small standalone c# .NET x86 executable file Sorry not open source, don't want it to be used at all or as part for commercial purpose... FREE I said !

fmDotNet is a .NET class to exchange data through FileMaker Server's web publishing engine. fmDotNet is written in C# using .NET 2.0. fmDotNet can be used in desktkop applications or on the web in ASP.NET pages with any .NET language (C#, VB.NET,...

Simplified ADODB interface library for MySQL on Mono/.NET. The library can be used to port MS ADODB project to an Mono environment.

ADP - Advanced Data Provider - is a transparent factory for ADO.NET which loads providers dynamically. It is written in C# and works on .NET, Portable.NET and Mono on Linux, Windows and MacOSX.

AhMeBa is an XML file-based metabase engine. It targets small data driven applications that don't require a powerfull database engine or need a light, mobile database such as personal websites and small bussiness applications.

The AAL implements specific abstractions built on the .NET that enables teams developing large-scale applications to succeed in an environment of rapid development and customer requirements changes.

Aristotle is an active training simulation that is capable of dynamically and adaptively training any subject in any language using the learners own personality traits and learning modality. This project is currently being developed in PHP/MySQL.

AutoProc (Stored Procedure Generator) is a couple of stored procedures which simplifies generating getter and setter procedures for a given Sql Server 2005/2008 table.

Automated Server Monitor (ASM) has been designed to monitor 1..n servers for service availability. This includes checking any TCP/UDP service, many popular databases including Firebird, MySQL and SQL Server. ASM has been written using Delphi and C#.

Aztec is a command based database application that has similar functionality and uses as SQL. Aztec operates around the "Core-Civilization" enabling interfacing with other applications along with highly customized client and IDE applications.