Claim: Blackfire Profiler has been actively developed since March 2015 where its architecture is based a PHP extension called Probe, and a server-side daemon called Agent which resulted it being used by some popular PHP projects such as ownCloud, Drupal, Symfony, and Laravel.
Evidence: As of March 2015 Blackfire is actively developed. Its architecture is based on a Probe, which is a PHP extension that gathers the raw performance profiles and an Agent, which is a server-side daemon that aggregates and forwards profiles to blackfire.io servers to visualize them. Blackfire has been used by some popular PHP projects such as ownCloud, Drupal, Symfony and Laravel to improve their performance and to spot performance bottlenecks.