If you want something that's more of a Slack/Discord alternative, gajim is receiving a lot of attention and polish lately, with Dino and Beagle as simpler alternatives. Source: over 1 year ago

I used Pidgin back in the day of AIM and ICQ, but nowadays, for XMPP, there’s Dino and Gajim for desktop and Conversations.im for Android. As far as I know, OTR has been superseded or replaced by OMEMO in most clients. Source: over 1 year ago

Https://gajim.org/ is a pretty good one. Source: almost 2 years ago

You can get a number from jmp.chat and use an app like Gajim (available on Windows/Mac/Linux). Source: about 2 years ago

On the desktop I use the gajim XMPP client. On my phones I use Conversations and Blabber (the latter is a fork of Conversations), and all messages between clients are encrypted with OMEMO. Source: over 2 years ago

As of 05 Nov 2022, https://muwire.com/ seems to have a certificate error, and no website is visible. Is there a backup website? Source: over 1 year ago

Now is a good time to get familiar with i2p (a fully encrypted private network layer) and all of the pirating possibilities it offers. Torrenting with i2psnark and direct p2p sharing with MuWire is already there. Several torrent clients have/are adding i2p compatibility as well, so snark isn't the only option. Hosting your own site on your own pc is incredibly simple too. Source: over 1 year ago

MuWire: Easy anonymous file sharing using I2P technology. Source: over 1 year ago

MuWire is actually I2P-based, it includes a whole I2P router and will use it: https://muwire.com/ and http://muwire.i2p. Source: almost 2 years ago

Well there's a solution that can at least address problem #2. It's an application called MuWire and it's designed for anonymous P2P file sharing using (you guessed it)I2P. It's really easy to install on any OS and it doesn't take long to get familiar with it. Source: about 2 years ago