Identify anything. pyWhat easily lets you identify emails, IP addresses, and more. Feed it a .pcap file or some text and it'll tell you what it is!
Digikey's choose-your-own-adventure subsite for identifying connectors.
PyCameraServer is a Flask video / image / Youtube / IP Camera frames online web-editor with live streaming preview for objects recognition, extraction, segmentation, resolution upscaling, styling, colorization, interpolation, using OpenCV with neural network models: YOLO, Mask R-CNN, Caffe, DAIN, EDSR, LapSRN, FSRCNN, ESRGAN.
A port of Google's language detection library from Java to Python.
An excellent article from the Internet Storm Center about carving executables out of other sorts of files (like .rtf documents) for the purposes of identification and reverse engineering.
A wiki page that documents explanations for and origins of various types of radio broadcasts people picked up with software defined radios and analyzed with software like GQRX.
3515 links, including 130 private