(M) Highly optimized, extremely modular and very flexible XMPP/Jabber server
"Best" is relative but to add to other voices maybe try also looking at Tigase XMPP Server (https://tigase.net/, https://github.com/tigase/tigase-server)?
IMPORTANT: due to a drive failure, as of 13-Mar-2021, the Mercurial repository had to be re-mirrored, which changed every commit SHA. The old SHAs and trees are backed up in the vault branches. Please migrate to the new branches as soon as you can.
I work on Snikket and Prosody, and can compare those two at least.
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Non Spring users what are you using ??
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