I am running a Debian Squeeze VPS and need a good IDS. I have used snort before and it was quite good but i am wandering if there are any other good ones out there.
Preferably compatible with modsecurity.
I personally prefer OSSEC. It is a free, open source tool backed up with commercial support.
a lot of IDS tools are on the internet and one of them is Suricata and here are comparison between it and snort Suricata vs Snort and there a lot of others like security onion,Smooth-Sec ,Alienvault OSSIM .....etc
Also commerical versions are available