Your results contain 17 solutions with the following criteria :

Databases
Solution Smile rating Users rating Popularity
Apache Derby No rating No rating
6%   Popularity on the site
FireBird No rating 4.5 Visitors
14%   Popularity on the site
HSQLDB No rating No rating
11%   Popularity on the site
Ingres No rating No rating
10%   Popularity on the site
SQLite No rating No rating
22%   Popularity on the site
Neo4j logo Neo4j No rating 5.0 Visitors
10%   Popularity on the site
Voldemort No rating No rating
18%   Popularity on the site