I sign up for a lot of products and betas, almost 1 every other day. I figure it is useful to share them here as like a running log
SportTrade - sports book that functions like a traditional market (similar to Novig without the sweepstakes law)
TwoCents - taking a different spin / direction on blind
PlayMoney - (ref link) manifold like prediction market that is exclusively play money and full opensource
Lava - btc backed loans using DLCs, here is a little review from me