CTFAssets.net is a website that provides a collection of open source tools for developers to use in their Capture the Flag (CTF) competitions. The site offers a variety of resources, including: - Pre-made virtual machines for CTF challenges - Tools for creating custom challenges and game mechanics - Libraries and APIs for helping with game development With an emphasis on open source software, CTFAssets.net aims to improve the overall quality and accessibility of CTF competitions to promote learning and growth among participants. The site is actively maintained by a team of volunteers with a strong passion for CTFs and their impact on the tech community.