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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Gajim and Dino both work on Windows and Linux and support most features you'd expect (Gajim is mature, Dino is a newer project and Windows support is still experimental). There is also Movim, a web client.
For Android there is basically one choice everyone will recommend: Conversations. There are several forks of it, and a few other alternatives.
Maybe you are remembering this bug from some months ago? It appeared exactly as if this was (accidentally) uploading keys to the user's XMPP server (not Converse.js's server) and publishing them.