xacc.ide is a opensource IDE aimed at mainly .NET development. It has a code editor written in 100% C# code, which is faster than most commercial offerings.
...Featuring an OOP macro system that works across all the languages. Contains all other languages as Lisp dialects. Fully OOP. Fully documented guided tour. language specs too. assembler, prolog, C#...
OpenTNF is a system-level tracing facility for capturing and presenting diagnostic information and performance metrics. Linux/Intel (kernel 2.2.x) is the initial target platform. The OpenTNF project is seeking developers for ports to other platforms.