The developer that everyone knows, or should at least. The name is CyanogenMod and they've been building the best, fastest, and most stable ROM's for Android phones for a while now. It is a free, community built distribution of the most current Android OS. At the moment that is Android 2.3.3 Gingerbread. CyanogenMod brings it to many, many devices, and at a faster speed than any manufacturer. Monday they released the latest CM7 RC2.