WP Engine also acquired and maintains Advanced Custom Fields [1] and Local [2] from their subsidiary Flywheel [3].
[1] https://deliciousbrains.com/wp-engine-acquisition/
[2] https://wpengine.com/blog/better-together-wp-engine-and-flyw...
[3] https://wpengine.com/blog/wp-engine-to-acquire-flywheel/