The document discusses open source software, including that it is freely available to download without cost, has openly accessible source code under an open source license, and has alternatives to major proprietary software. It encourages attending user groups and contributing to open source projects to gain skills, collaborate, and demonstrate abilities to future employers. Suggestions are given for how to get involved, such as identifying alternatives, joining communities, filing issues and requests, and starting with user groups or existing open source projects.

1. Open Source Software Tushar Joshi Java User Group Nagpur

3. Source: http://www.thegeminigeek.com/what-is-the-difference-between-open-source-and-closed-source-software /