Edited 2015/06/16 - added Forescount CounterACT.
Edited 2015/12/17 - added Security Onion.
Edited 2016/01/19 - added Kali Linux.
The following is a list of posts made by various members of the community which provide guidance on how to get 3rd Party virtual machines integrated into VIRL.
A10 vthunder - A10 vThunder running just fine into VIRL - Thanks to @ntarenne!
Arista vEOS - Arista vEOS image on VIRL - Thanks to @ntarenne
Alcatel 7750 SR - Adding the Alcatel Virtualized Service Router to VIRL 2 - Thanks to @ntarenne
Citrix Netscaler - How to add Citrix NetScaler VPX Platinum to VIRL - Thanks to @Virtualpackets
Cumulus VX - Running Cumulus VX in VIRL topologies -
Thanks to @flex
Extreme Networks - Adding the Extreme XOS virtual machine to VIRL - Thanks to @ntarenne
F5 BIG IP - Documentation in progress
Forescount CounterACT - Forescout CounterACT - Thanks to @keroger2k
Fortinet FortiGate - FortiGate Firewall using VIRL - Thanks to @Virtualpackets
HP VSR1k - HP VSR1000 running into VIRL - Thanks to @ntarenne
Juniper vMX - Playing with Juniper vMX on VIRL - Thanks to @ntarenne and @Remus_Grobei
Juniper vSRX - vSRX and ASAv - how to import to VIRL? - Thanks to @pandom_
Kali Linux - How to: Kali Linux in a VIRL topology
Palo Alto Networks - Adding the Palo Alto virtual machine to VIRL - Thanks for @Virtualpackets
Security Onion - Security Onion on VIRL installation guide
Windows - Windows 7 image creation within VIRL Host - Thanks to @gravityns
A big 'thank-you' to all of the people listed above who've spent their time working on this and putting up the information for others to follow!
If you have details of a VM that you can share, please let us know and we'll add it to the table.
To see how to add a custom image to VIRL, go through this post:
Add Custom Virtual Machines to VIRL