oRA2 is a lightweight alternative for CTRaidAssist.
It should support all addon messages sent by CTRA and reply correctly to them. oRA2 has no raidframes, use your own favorite ones. oRA2 does have maintanks and playertargets.
More information on supported features: http://www.wowace.com/wiki/oRA2
If you enjoy using this addon and feel you want to donate: