Website where dev builds of emulators are compiled. Useful as a convenient means of getting more up to date versions of emulators. Windows versions are usually posted. They will make builds for emulators without testing to even see if they work. Many times they do not test the builds they post.
If a website has an official respository to post dev builds, then it's recommended to use that instead.
You could also try to compile the builds yourself from the source code.
Name is short for "Emulator Crimson Rain".
Notable for having low quality comments.