Overall, according to OpenLogic, the top 16 hottest open-source projects based on growth from 2010 to 2011 were:
1. HBase (http://hbase.apache.org/)
2. Node.js (http://nodejs.org/)
3. nginx (http://nginx.org/)
4. Hadoop (http://hadoop.apache.org/)
5. Ruby on Rails (http://rubyonrails.org/)
6. MongoDB (http://www.mongodb.org/)
7. Tomcat (http://tomcat.apache.org/)
8. MySQL (http://www.mysql.com/)
9. Apache HTTP Server (http://httpd.apache.org/)
10. Spring Framework (http://www.springsource.org/)
11. PostgreSQL (tie) (http://www.postgresql.org/)
11. Grails (tie) (http://grails.org/)
12. Struts (http://struts.apache.org/)
13. JBoss (http://www.jboss.org/)
14. GlassFish (http://glassfish.java.net/)
15. CouchDB (http://couchdb.apache.org/)
As stated, OpenLogic also evaluated each category and categorized projects as “trending up” (up across most or all metrics), “trending level” (up and down on a roughly equal number of metrics), or “trending down” (down across all or most metrics).
For the Application Server/Web Server category: Node.js and nginx were trending up; Tomcat and Apache HTTP Server were trending level; and JBoss and GlassFish were trending down.
For the Frameworks category: Ruby on Rails was trending up; Spring Grails and Struts were trending level, with no projects trending down.
For the database and big data category: HBase, Hadoop and MongoDB were trending up; MySQL and PostgreSQL were trending level; and CouchDB was trending down.
The OpenLogic report ranked year over year–January 2010 through November 2010 and January 2011 through November 2011–data based on growth or loss on several metrics. The data comes from several sources including public data from Google searches. The report also evaluated OpenLogic OLEX search volume, views of packages, downloads, requests within corporations to use the project and matches against the project during scans. OpenLogic OLEX is a software-as-a-service solution for the governance and provisioning of open-source software used by many Fortune 100 companies. OpenLogic also aggregated data on customers purchasing support contracts from OpenLogic for each project, as well as projects that users deployed through OpenLogic CloudSwing, an open platform-as-a-service offering.