Photrio Forums – Formerly APUG.org, this forum is bursting with knowledgeable darkroom folk.
https://www.photrio.com/forum/home
The Massive Dev Chart – find development times for pretty much any film and developer combination you can come up with. The app is absolutely worth the purchase price for anyone who processes film regularly.
https://www.digitaltruth.com/devchart.php
Unblinking Eye – Traditional Darkroom Photography & Historical / Alternative Photographic Processes.
Pacific Rim Camera Reference Library – a fantastic collection of historical photography sales catalogs and instructional literature.
https://www.pacificrimcamera.com/rl/rlrindex.htm
Transporting & Storing Film – Advice from Kodak
https://www.kodak.com/en/motion/page/transporting-storing-film
Pakon.au Forums – this brand new forum will hopefully gain a bit of traction and get Pakon scanner information into a searchable place: