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

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