Christian Pietsch (old acct.)#Cwtch sounds interesting because it is based on a private and anonymous @torproject #OnionSite (much like #Briar). I hope it will become available via @fdroidorg soon.
#Berty is kind of interesting because if uses #IPFS which is not as bad as people might think just because the Web3 cryptobros use it. Sadly, the Berty website relies on Google Amp and Amazon Cloudfront. 