Cross-platform Programming

Some cross-platform programming IDE & tools:

1) Code::Blocks (an alternative to Microsoft VC++ IDE in Linux or even Windows): http://www.codeblocks.org/
2) wxWidgets (cross-platform GUI programming library): http://www.wxwidgets.org/downloads/
3) ...

Mono - cross platform, open source .NET development framework

http://www.mono-project.com/Main_Page

Mono is a software platform designed to allow developers to easily create cross platform applications. Sponsored by Xamarin, Mono is an open source implementation of Microsoft's .NET Framework based on the ECMA standards for C# and the Common Language Runtime. A growing family of solutions and an active and enthusiastic contributing community is helping position Mono to become the leading choice for development of Linux applications.