Acronym: Open Source Initiative
From the homepage:
- Open Source Initiative (OSI) is a non-profit corporation dedicated to managing and promoting the Open Source Definition for the good of the community, specifically through the OSI Certified Open Source Software certification mark and program. You can read about successful software products that have these properties, and about our certification mark and program, which allow you to be confident that software really is “Open Source.” We also make copies of approved open source licenses here.
TakeDown.NET -> “Open-Source-Initiative”