List of VPS Free Trials :

http://info.desktone.com/cloudhosted.virtual.desktop.free.trial.html (7day)  
http://www.cloudshare.com/ (14 days trial)  
https://east1.openhosting.com/accounts/trial/ (5 days trial)  
http://www.vps.me/ (more than one year)  
http://www.elastichosts.com/cloud-hosting/free-trial (5 days trial)  
http://vexxhost.com/trial/ (7 days trial) http://www.atum.com/ (15 
days trial) http://www.desktone.com/free_trial (7 days trial)  
http://www.cloudee.eu/preorder (6 days trial)  
http://www.host1free.com/free-vps/(6 days trial)  
http://www.rsaweb.co.za/cloud-servers-free-trial/ (7 days trial)  
http://www.sublimeip.com/services/cloud/free-trial/ (5 days trial)