Free software or software libre is software that can be used, studied, and modified without restriction, and which can be copied and redistributed in modified or unmodified form either without restriction, or with minimal restrictions only to ensure that further recipients can also do these things. For more information, see the wikipedia article : Free Software
Here is a non-exhaustive list of free software used by marelibri :
For production :
-
Linux / 
Ubuntu Server -
Apache - serveur http - JBoss AS - application server
-
JBoss Seam - Web site creation framework - PostgreSQL - database engine.
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Sphinx Search - Full text search engine
For creation :
