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Flowgrind vs Ethr: catalog facts
Flowgrind	Ethr
Free Free and open source under GPL-3.0-or-later.	Free Free and open source under the MIT licence.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Measures several TCP performance metrics Supports distributed tests between arbitrary endpoints	Covers TCP, UDP and ICMP in one tool Same tool on Windows, Linux and macOS
Supports Linux, FreeBSD and Mac OS X only Requires libxmlrpc-c	Command-line only No formal releases listed on the repository
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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