mingw-w64

GCC for Windows 64 & 32 bits

All other downloads

Darwin/OSX - Automated Builds with buildbot

Most current Darwin toolchains have been built through automated builds on volunteers' machines with buildbot. These are nightly builds, using the then most recent source available for GCC, binutils and the CRT. They are therefore experimental and best avoided except for specific reasons.

Runs on Builds for Date Languages C11/C++11 Threading Download
Darwin 32 i686 2013/05/31 C, C++ Not supported SourceForge
x86_64 2013/06/22 SourceForge

Additional Software: None.

 

Rubenvb toolchains

Rubenvb has built a number of toolchains including some for less common setups. They are split into two categories: toolchains targeting Win32 or Win64.

OpenSUSE

The OpenSUSE Linux distribution also has a large and well-maintained set of packages for cross-compilation.

A very large number of other binaries and sources are hosted in the File Release System on Sourceforge which might have what you are after.