This presentation concerns aspects, elements and data for exploiting Open Source Educational Software (OS/EdSw) within the framework of “Teacher Training Programs in the Educational Use of ICT”. The related activities to be presented specifically concern the adaptation of a series of 14 titles of OS/EdSw for the Hellenic educational system, including, where needed, the Greek localization of instruction manuals and educational activities. The here referred titles concern the subjects of Mathematics, Literature, Physics and primary education.