Your results contain 4 solutions with the following criteria :

High availability
Solution Smile rating Users rating Popularity
HAProxy HAProxy 3.3 Smile 3.8 Visitors
40%   Popularity on the site
Keepalived Keepalived 3.2 Smile No rating
18%   Popularity on the site
LVS LVS 3.2 Smile No rating
19%   Popularity on the site
Linux-HA Linux-HA 3.5 Smile No rating
27%   Popularity on the site