This document discusses free and open source software (FOSS) and the role of library and information science (LIS) professionals in the contemporary open source movement. It covers the philosophy of FOSS, emphasizing freedom and community-based development. Techniques for developing FOSS include scratching an itch to solve a problem, using mailing lists to facilitate communication, and improving through collaborative efforts. FOSS relies on determination, devotion and dedication from its community. The proliferation of information and communication technologies has created opportunities for LIS professionals to actively participate in and contribute to the open source movement.