Session is a decentralized alternative to signal. It doesn’t require a phone number and all traffic is routed through a tor like onion network. Relays are run by the community and relay operators are rewarded with some crypto token for their troubles. To prevent bad actors from attacking the network, in order to run a relay you have to stake some of those tokens first and if your node misbehaves thay will get slashed.

Have a look at xmrbazaar.com, it’s not open source yet, but it will be after they get out of beta.