There are Unix ports of most of the traditional PuTTY tools, and also one entirely new application.
If you look at the source release, you should find a unix
subdirectory. You need cmake
to build it; see the file README
in the source distribution. This should build you:
pterm
- an xterm
-type program which supports the same terminal emulation as PuTTY.
If you don't have Gtk, you should still be able to build the command-line tools.