JellyfiSSH is the leading Mac OS X bookmark manager for connecting to *NIX boxes like BSD/Linux etc via Telnet or SSH 1 or 2.

You can set preferences for each bookmark including the terminal colours, fonts, window size, transparency and default login.

Version 5 introduces bonjour browsing of ssh machines, grouping - which allows you to collect similar bookmarks into groups for better management - especially for large numbers of bookmarks, and an improved tunnel setup interface.