Here are my favourite tools (web application, commercial, and open source software) that may have affiliate links:
Blogging
Genesis Framework
SiteGround (web hosting)
Namecheap (domain name registrar)
WordPress (free and self-hosted)
Cloud
Dropbox
Google Drive
Coding
Atom (text editor)
Brackets (text editor)
Xcode
WinSCP (FTP)
Macintosh
Skitch (screen capture)
ImageOptim (image optimizer)
Zipeg (open ZIP and RAR files)
Sophos Antivus
SEO
Integrity (Mac)
Screaming Frog SEO Spider (Mac and Windows)
Testing
Firebug
Screencast-O-Matic
LonelyScreen
Other
f.lux – adjust the light setting of the screen (FREE)
Launchy – program launcher (Windows, FREE)
HandBrake – video converter (FREE)
Mobile Apps
Coursera
Udemy
edX
TheFreeDictionary
WordPress
Snapseed (photo editor)
Pcalc Lite (calculator)
Onto to you.
What are your favourite tools? Let me know.