zsync(1) on Linux
The text 20ce9fd9ce1b, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
Partial/differential file download client over HTTP
Flags it lists
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-A -
-V -
-i -
-k -
-o -
-q -
-s -
-u