[OT] splunk alternatives

[Shane]

Hey All,

For anyone unfamiliar on splunk its "an enterprise-level search tool
that can index logs and IT data, including server events, network
events, and application events from one or more servers or network
devices."  http://splunk.com

Anyhoo been messing with it a bit and its pretty cool / handy for
consolidating multiple server and network devices logs into a single
point for searching etc. The annoying part is all of its really cool /
powerful features are only available in the pro edition which I can't
get purchase approval for so my question is, does anyone know of any
good alternatives to splunk, preferably of the open source / free so
that we can both use and modify the tool as needed?

TIA
Shane.