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GCstar vs Tellico: catalog facts
GCstar	Tellico
Free Free and open source under the GPL-2.0-or-later licence.	Free Free and open source under the GPL.
Windows, macOS, Linux	Linux
Many built-in collection types plus custom models Plugins fetch item details from the web	Fetches item details from Google Books, IMDB, Discogs, IGDB and more Custom collections and fields
GTK and Perl interface looks dated on Windows and macOS	Mainly aimed at Linux and KDE desktops Online lookups depend on third-party sources
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-2.0-only OR GPL-3.0-only
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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