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b2 vs MAME: catalog facts
b2	MAME
Free Free to download from GitHub.	Free Free and open source under the GPL 2.0. No ROMs are included.
Windows, macOS, Linux	Windows, macOS, Linux
Covers several Acorn BBC models and the Olivetti PC 128 S Runs on Windows, macOS and Linux	Covers thousands of arcade, console and computer systems in one program Accuracy is the stated priority, so behaviour matches the original hardware
Limited to BBC Micro family machines Documentation lives mainly in the repository	Accurate emulation of later hardware needs a genuinely fast machine ROM sets must match the exact version MAME expects, which frustrates newcomers
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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