Don’t forget to check out the Free eBooks For Photographers, Non Photography Advice For Photographers and Books For Photographers pages.
Gear
Peak Design (The best camera straps and more)
ThinkTank (The standard for camera bags)
Elinchrom (The light modifiers I use)
Manfrotto (Tripods and more)
Cactus (Flashes and wireless triggers)
Loupedeck (Faster editing with this hardware console)
Learning
Photography Domination (Best online photography courses)
Masterclass (Learn from the masters)
CreativeLive (Courses for creatives)
PHLearn (Photography tutorials)
RGG EDU (Advanced tutorials)
You can also find some nice gems on these more general sites:
Udemy
Coursera (Free university courses)
Lynda (From beginner to advanced, technique to software)
Skillshare (Learn from other creatives)
Books
Amazon
Barnes & Noble
Bol.com
FNAC
TASHEN
–> see Books For Photographers
Marketing
Moo (Beautiful businesscards)
SendInBlue (Newsletters)
GetResponse (Even better newsletters)
Hootsuite (Social media mangement)
Website Tools
WordPress
Format (Websites for creatives)
FloThemes (WordPress themes for photographers)
SiteGround (Hosting)
One.com (Hosting)
Weebly (Website creator)
Productivity
Doodle (Schedule meetings)
Workflowy (Map your brain)
Dropbox (Cloud storage)
WeTransfer (Send large files)
1Password (Simple, convenient security)
Dashlane (The password manager I use)
Other
Grammarly (Free writing assistant)
Headspace (Mediation made simple)
Gaia (Yoga courses that keep me sane)
Blurb (Create your own photobook)
Fiverr (Find a freelancer for design, websites,…)
Adobe (Lightroom & Photoshop)
GoPro (Great cameras for behind the scenes footage)