We Bull SI believe that open source products are mature enough to realize the comprehensive and effective solutions. Here are some products and technologies we use in our daily work:

Portal development Liferay Portal Server
Application servers JBoss Application Server, IBM WebSphere
Business Process Management Activity, IBM Business Process Manager
Web services SOAP, SOAP w. Attachments, WS-I*, WS-Interoperability Basic Profile, UDDI, JAX-WS, MTO, REST, JAX-RS
Service registry and repository UDDI
RDBMS PostgreSQL, Oracle DB Server
ORM JPA, Hibernate
Reports Jasper Reports, Jasper iReport, Jasper Server
OLAP Mondrian, Jasper Analysis
Monitoring ZABBIX
UML modeling Sparx Enterprise Architect
Application development Eclipse, JBoss Tools, JBoss SEAM, JBoss RichFaces, ZK Framework
Programming languages Java (J2SE, J2EE)
Issue tracking JIRA
Development methodologies OpenUP, RUP, TOGAF
Misc Mobile applications development for Android platform