MacTerm 4 — 

Powerful replacement for Terminal on older 32-bit macOS / OS X systems, supporting 24-bit color, standard graphics protocols and iTerm2 image sequences and color schemes.  Written by Kevin Grant.

MacTerm 4.1 does not work on macOS 10.15 “Catalina” or later versions.  A new version is in development; please check out the latest build if you need to use Catalina.

Download Version 4.1 (stable)

 — 32-bit for macOS / OS X 10.10 - 10.14, ~4 MB

To run on OS X 10.3.9+, download the older 4.0.0 release.

See also the original telnet client for Mac Classic.