See is a lightweight text file and man page viewer for X windows. It
maintains "document meta-data" for each user, allowing them to
automatically keep bookmarks and highlights for read-only system files.
It also has a "server mode" so that command line requests can be sent to
a single running server rather than starting multiple instances. Other
features include hypertext-style apropos (man page) searches, file
monitoring, regular expressions, command history, and nice little toggle
lights on the interface for the server and file monitor. There's also
cross-application drag-n-drop support, and handy little features that
allow you to view the output of shell commands and process the text
buffer with an external command (sed, awk, grep, perl, etc.) See is
POSIX compliant.