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Flowgrindnuttcp
Free

Free and open source under GPL-3.0-or-later.

 Free

Free and open source.

macOS, Linux, Command line Windows, macOS, Linux, Command line
  • Measures several TCP performance metrics
  • Supports distributed tests between arbitrary endpoints
  • Handles high-throughput TCP and UDP testing beyond typical consumer speed tests
  • Cross-platform command-line tool suited to scripting and automation
  • Supports Linux, FreeBSD and Mac OS X only
  • Requires libxmlrpc-c
  • Requires installing and running the tool on both ends of the connection
  • Command-line only, with a learning curve for new users
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0-or-later License not stated
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 8, 2026

Checked September 22, 2026

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