I am sure there was a post of these sites prior but since I just joined the group I'm going to post the ones I am familiar with. Of course there is one also (Nature Conservancy) on the C2 Click to Donate page). I used to click on some other sites but they no longer exist.
www.caretoclick.com/save-the-rainforests (you can earn more by sharing on FB and/or Twitter)
http://www.brotherearth.com/en/top.html (choice of rainforests of Peru or Rainforest Rescue of Central and South America)
http://therainforestsite.greatergood.com/clickToGive/trs/home?ThirdPartyClicks=ERT_042213_TRS_m (allows multiple clicks per day)
Thanks for links to click and help the rainforests. Nice to see you here