lwatch is a log parser/analyzer written in C with the PCRE library. It is small and efficient. You are able to define your own colors using regexp patterns. The biggest advantage compared to other tools written in Perl is its speed.
RRDcollect is a daemon that polls certain files in
the /proc/ directory, gathering data and storing
it inside RRDtool database files. It supports both
scanf-style pattern matches and Perl-compatible