Is there a way to test TRILL in a virtual lab? I don't have access to devices to run TRILL for testing and learning purposes, so is there a way to set-up a virtualized lab to try it ? What would be the virtualisation system, the vendor, the software, the version...

There are few devices that support standards based TRILL in the real world.

Traditional Cisco IOS is probably the most /supported/ network OS for running in a hypervisor; however, in Cisco land the NXOS platform is the only platform that supports Fabric Path (Cisco's TRILL), and that won't work in Dynamips or IOU.

Furthermore TRILL is a L2 technology. Switches are hard to virtualize because of the special forwarding hardware (TCAM) used in them.

In short I'm afraid you're out of luck on using virtual switches to test TRILL.