Gajim

Install

sudo apt install python-cryptography gajim gajim-omemo gajim-plugininstaller gajim-urlimagepreview 

Plugins

• gaim-plugininstaller: Make sure you have this so you can then easily add more plugins from within gajim.
• urlimagepreview: You want this - you might have to turn it on in the plugin settings

More download options (including Windows) are here.