Junos like open source routing software.

I simulate networks with Cisco and Juniper routers on my PC to study and understand very well about routing protocols. With GNS3 my life became simple in emulating Cisco routers. Running Juniper routers on Olive is kind tedious but one of my friends was gracious enough to prepare an Olive VM for me. But I wanted to run more routers with less trouble and I found that the following company offers a Junos like OS for free(offcourse without support). They do have some paid services which I do not need to care at this point. Please click on the following link to more about their product and download.

http://www.vyatta.com/