U++ : A C++ cross-platform rapid application development suite focused on programmers' productivity without sacrificing runtime performance

U++ is a C++ cross-platform rapid application development suite focused on programmers' productivity without sacrificing runtime performance. Based on strictly deterministic design, it provides a viable alternative to garbage-collected platforms, even for business logic oriented problems.

• Licenses : BSD Revised, LGPL, GPLv2, Public Domain, zlib/libpng
• Operating Systems : POSIX, Linux, Windows, FreeBSD
• Implementation : C++

Padre : An IDE for Perl developers

Padre is an IDE for Perl developers. It provides syntax highlighting for many languages, but for Perl it also provides refactoring tools.

• Licenses : Perl
• Operating Systems : POSIX, Linux, Windows, Mac OS X
• Implementation : Perl