This community maintained list showcases free tools and services for open source software development on .NET. If you know of any additions to this list PR a change. This list focuses on services specifically supporting .NET development - a list covering a wide range of platforms is available at OSS Perks.
Please sort projects alphabetically and provide a one-line description. Where possible links should be to a page showing free open source plans (for example a web page, blog post or pricing page with open source plan detailed). Create new sections, as appropriate.
- ReSharper - Visual Studio extension providing code analysis, formatting, refactoring and more.
- Visual Studio Community - Full version of Visual Studio available free
- VS Anywhere - Visual Studio extension for in IDE collaborative development.
- Xamarin - Share .Net code across Windows, iOS, Android and Mac.
- AppVeyor - Windows based cloud build/CI servers tailored for .Net developers.
- TeamCity at CodeBetter - JetBrains TeamCity CI server made available for open source projects by CodeBetter.
- TravisCI - Hosted CI service supporting .Net builds via Mono on Linux.
- ANTS Memory Profiler - .Net memory profiler from redgate.
- ANTS Performance Profiler - .Net performance profiler from redgate.
- dotTrace - Performance profiler for .Net applications
- PostSharp - Aspect-oriented programming tool to eradicate boilerplate code.
- Coverity Scan - Static analysis service to identify defects in C# code.
- dotCover - Code coverage tool integrated with Visual Studio.
- .Net Reflector - Browse, analyse and decompile IL code.
- MyGet - Publish public NuGet feeds of your packages for free.
- Bugsnag - Cross platform error reporting.
- Azure SDK for .NET - Easily build, manage, and deploy cloud-scale apps with Visual Studio and Azure.