PixelFed - PixelFed is a federated image sharing platform, powered by the ActivityPub protocol.
BucketList.net - Bucket list ideas, advice and support
Gab - Gab is an ad-free social network dedicated to free speech.
Life Listr - ***AS FEATURED BY APPLE***
Friendica - Decentralisation - Privacy - Interoperability
Bucketlist.org - Log and catalog all the stuff you want to accomplish before you expire.