MonoDevelop is a cross platform IDE mostly aimed at Mono/.NET developers
Cross platform parser for the Gherkin language. Used by Cucumber to parse .feature files.
Cross platform GUI framework for desktop and mobile applications in .NET
Go Struct and Field validation, including Cross Field and Cross Field Cross Struct validation
A cross platform manga/doujinshi manager with tagging support
Bread Player, a free and open source music player powered by UWP and C#/.NET with a sleek and polished design built for, and by, the people seeking a better alternative to Groove and Windows Media Player by Microsoft.
A Simple Cross Origin Resource Sharing for Lumen Framework (5.0|5.1).
PromisePipe - reusable cross process promise chains
A cross platform tray monitor to trigger builds, receive the notifications from QuickBuild
Cross a pomodoro timer with your favourite task + todo + issue management software and make it all hacker friendly.
Hexa is a high level, strictly typed programming language!