Your results contain 5 solutions with the following criteria :

Cloud computing
Solution Smile rating Users rating Popularity
Cloud Stack No rating No rating
42%   Popularity on the site
Eucalyptus logo Eucalyptus No rating No rating
28%   Popularity on the site
Nimbus No rating No rating
25%   Popularity on the site
OpenNebula logo OpenNebula 4.0 Smile 4.8 Visitors
94%   Popularity on the site
openstack OpenStack 4.3 Smile 4.5 Visitors
100%   Popularity on the site