Software:
Image Review/Processing Tools:
Adobe - Makers of Photoshop & Lightroom (and a ton or other products)
DxO - Makes of Photolab, an excellent RAW converter & also the Nik Suite
Raw Photo Processor (RPP) - One of the best RAW converters period. Highly capable with high-precision math used for all calculations. Super powerful and capable of extracting incredible detail from RAW files. Steep learning curve!
Iridient Digital - Maker of the excellent RAW converter Iridient Developer
Topaz Labs - Makes of a whole slew of photography tools
AutoFX Software - Makers of interesting photo tools
Fast Raw Viewer (FRV) - "The Only Real WYSIWYG Raw Viewer" - Best $20 I ever spent! Fast, great for culling images before import. Crucial part of my workflow. Also check out their RawDigger if you want to get deep into Raw files.
Operating System Tools:
Daisy Disk - Mac OS Disk Usage Visualization
Hardware:
Cameras & Lenses:
Canon: https://www.usa.canon.com & Canon Firmware Downloads
Nikon: https://www.nikonusa.com & Nikon Firmware Downloads
Fujifilm: https://www.fujifilmusa.com/ & Fuji Firmware Downloads
Pentax (Now part of Ricoh): https://us.ricoh-imaging.com & Firmware Downloads
Leica Camera: http://us.leica-camera.com & Firmware Downloads
Sigma: https://www.sigmaphoto.com & Firmware Downloads
More coming, but thought I'd get this out there. If you have any links to suggest, please let me know and I'll add them here.
Cheers!