The Trustworthy Software Foundation (TSFdn) is a not-for-profit Company Limited By Guarantee based in London. Its mission is to enhance the overall software and systems culture by promoting the design, implementation, and maintenance of trustworthy software. The foundation aims to collect, organize, and share knowledge, experience, and capabilities from the UK public and private sectors, as well as academia, to provide a curated view of available information.

The TSFdn evolved from the Trustworthy Software Initiative (TSI), which aimed to address the lack of secure software development practices in the UK. The foundation operates in partnership with various stakeholders, including the Advisory Committee on Trustworthy Software (ACTS) and the Institution of Analysts and Programmers. The TSFdn offers a Trustworthy Software Body of Knowledge (TS-BOK) that serves as a comprehensive resource for best practices.

They also have working groups dedicated to training and education, as well as maintaining coherence with activities in other areas. Stay updated with TSFdn's latest news and developments through their social media channels: LinkedIn, Twitter, RSS, and Facebook