FusionAuth is an open-source authentication platform that has saved Recon InfoSec, a managed security services provider, from having to build their own middleware or spend money on alternative solutions. It provides seamless user experience for end-users and integrates well with various tools and platforms such as AWS Cognito, Graylog, Velociraptor, osquery, TheHive, RocketChat, and Moloch. FusionAuth's robust API has also made it easy to integrate with internal tools, contributing factors in the company's decision to use it. Whitney Champion, lead architect at Recon InfoSec, praises FusionAuth's support for open-source principles, security, and documentation, making it a reliable choice for their authentication needs.