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.