Detectron is queued for analysis. Crawling candidates and ranking them takes a few minutes. This page updates itself when the list exists — you can also come back later.
What is known so far comes from the other direction:
These projects were analysed and named Detectron among their alternatives. The relationship is not symmetric — how Detectron rates them is a separate judgement, made when Detectron is analysed in its own right.
calls Detectron “Original Caffe2 research platform for Mask R-CNN; choose for legacy Caffe2 deployment, but it is archived.”
Mask R-CNN for object detection and instance segmentation on Keras and TensorFlow
calls Detectron “Choose for FAIR's Caffe2-based detection platform if you need legacy Detectron models, but it is archived and superseded by Detectron2.”
Mask R-CNN for object detection and instance segmentation on Pytorch