You should download it and give it a run on a VM. It's free for eval use (license is good for 500mb/day for 30 days, then reverts to a free 50mb/day license with limited functionality). I even deployed it in Amazon's AWS service for shits and grins once. :D
Build a VM or phsyical linux box, install/configure syslog-ng, and have Splunk monitor the syslog-ng output file. Then point other devices to udp/514 on your new Splunk box/VM. :D
Chris