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Ethr vs Flowgrind: catalog facts
Ethr	Flowgrind
Free Free and open source under the MIT licence.	Free Free and open source under GPL-3.0-or-later.
Windows, macOS, Linux, Command line	macOS, Linux, Command line
Covers TCP, UDP and ICMP in one tool Same tool on Windows, Linux and macOS	Measures several TCP performance metrics Supports distributed tests between arbitrary endpoints
Command-line only No formal releases listed on the repository	Supports Linux, FreeBSD and Mac OS X only Requires libxmlrpc-c
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
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 October 2, 2026	Official website Full listing and sources Checked October 8, 2026

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