A powerful replacement for the macOS Terminal, with 24-bit color support. Written by Kevin Grant.
Free Download of Version 4.1 (BETA)
— for macOS / OS X 10.9+ (Mavericks, Yosemite, El Capitán), ~4 MB
For OS X 10.3.9+, the 4.0.0 release is available.
See also the original telnet client for Mac Classic.