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GTKTerm vs HTerm: catalog facts
GTKTerm	HTerm
Free Free and open source.	Free Freeware; the author accepts donations via PayPal.
Linux	Windows, Linux
Simple graphical interface Lightweight GTK application	ASCII, hex, binary and decimal input and output Works with hardware and virtual USB serial ports
Linux only Serial connections only	Closed source freeware Configuration is done through an XML file
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License: Freeware
No account needed	No account needed
Works offline	Works offline
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.