Rally by Eventbrite - Find the best local events and rally your friends to join
BucketList.net - Bucket list ideas, advice and support
Triip.me - The happiest way to travel in 227 countries
Life Listr - ***AS FEATURED BY APPLE***
Klook - Discover & book amazing experiences at exclusive prices
Bucketlist.org - Log and catalog all the stuff you want to accomplish before you expire.