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Asuswrt-merlin
[Asuswrt-merlin] ([Download]) is a custom firmware based on Asuswrt, the opensource firmware used by recent Asus routers.
It supports the following models: RT-N16, RT-AC56U, RT-N66U, RT-AC66U, RT-AC68U.
Since it's based on Asuswrt, it uses the official webui, while adding several useful features, like SSH access, Cron jobs, customizable user scripts and several minor tweak/enchantments.