A list of resources follows.
minirsyslogd: http://www.clueby4.org/minirsyslogd/
syslog-ng: http://www.balabit.com/products/syslog_ng/
msyslog: http://sourceforge.net/projects/msyslog/
stunnel: http://www.stunnel.org/
cryptcat: http://farm9.org/Cryptcat/
Swatch: http://swatch.sourceforge.net/
Logcheck: http://sourceforge.net/projects/logcheck/
RFC 3164: The BSD Syslog Protocol
RFC 3195: Reliable Delivery for syslog