Remind is a sophisticated calendar and alarm program for the command line. It was written and is maintained by David Skoll of Roaring Penguin Software.
The installer puts all the files under /usr/local/, so the binary or the manual page may not be in your default search path. Try adding these to your .bashrc if you experience problems:
export PATH="$PATH:/usr/local/bin/"
export MANPATH="$MANPATH:/usr/local/man/"