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NTttcp vs Ethr: catalog facts
NTttcp	Ethr
Free Free and open source.	Free Free and open source under the MIT licence.
Windows, Command line	Windows, macOS, Linux, Command line
Official Microsoft throughput tool Prebuilt binaries available	Covers TCP, UDP and ICMP in one tool Same tool on Windows, Linux and macOS
This repository targets Windows only Command-line only	Command-line only No formal releases listed on the repository
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
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 October 2, 2026

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