Log manager. If you use one what do you use?:)

[SimpL]

Just a quick question

The Why:
I'm looking for a log manager that could manage multiple syslogs from 5-10 servers (all openbsd vm) Dont want a cloud solution this is lan only setup vm-s are on one machine and it has no Internet connection (partial only, and slow 28k modem/2g mobile slow)
I found a few if you have some opinion about them i would gladly have some thoughts about them from the community

Graylog - No direct port for OpenBSD
Nagios - Needs components that i don't want/can install on all servers...
GoAccess - did not try it yet
Logstash - did not try it yet

These are all free to use in certain situations but that doesn't mean all of the suggestions have to be free. If you use a good one that is perfect for you that is what i want to hear.

If there is are suggestions ill try to do a poll too if possible

Thanks
SimpL

ps.: If this would be better in general im sorry... (to the mods please if in your opinion this belongs to general if you can put it there thank you!)