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Spectrum 2 vs Matterbridge: catalog facts
Spectrum 2	Matterbridge
Free Free and open source.	Free Free and open source under the Apache 2.0 licence.
Self-hosted	Windows, Self-hosted, Command line
Bridges users on different IM networks Runs on your own server	Bridges a long list of chat protocols REST API for custom integrations
Server software that needs setup and an existing messaging server Little end-user documentation on the homepage	Last code update in December 2024 Needs a server or always-on machine to run
Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License: GPL-3.0	License: Apache-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.