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fend vs Wombat: catalog facts
fend	Wombat
Free Free and open source.	Free Free and open source under GPL-3.0.
Command line	Linux
Arbitrary-precision arithmetic Built-in unit handling and conversion	Calculations include physical units and dimensional analysis Keeps a live interpreter session and calculation history
Command-line interface only, with no graphical calculator	Available for GNU/Linux
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 8, 2026

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