Bing/Yahoo

• Bing Webmaster Tools

Google

• Google Schema Validator
• Google Rich Text Validator
• Google AdSense
• Google Analytics
• Google Search Console

Facebook

• Facebook for Developers Sharing Debugger
• Facebook Help Center
• Facebook Ads and Post Boosting
• Facebook Size Dimensions
• Facebook Analytics

LinkedIn

• LinkedIn Post Inspector
• LinkedIn Ads
• LinkedIn Premium
• LinkedIn Analytics

Twitter

• Twitter Card Validator
• Twitter Business Scheduled Tweets
• Twitter Ads
• Twitter Promoted Tweets
• Twitter Card Specifications
• Twitter Analytics

Pinterest

• Pinterest Rich Pins Validator
• Pinterest Schedule Pins
• Pinterest Ads
• Pinterest Promoted Pins
• Pinterest Pin Sizing
• Pinterest Analytics

Instagram

• Instagram Ads and Promoted Posts
• Instagram Image Help
• Instagram Analytics

Misc Validators

• Free Open Graph & Twitter Card Meta Data Reader
• iFramely
• Hey Meta
• Open Graph Tester

Meta Tags

• Free Basic Website Meta Tag Generator
• Free Basic Open Graph & Twitter Card Generator
• Free Basic Website Schema Generator (JSON)

Site Speed Test

• PageSpeed Insights

Statcounter

• Browser Marker Share
• OS Market Share

Others

• Schema.org
• InternetLiveStats.com
• w3techs.com
• Verisign.com

Acer

• Drivers and Manuals
• Diagnostics

Asus

• Download Center
• Diagnostics

Dell

• Dell Support
• Diagnostics

HP

• Customer Support - Software and Driver Downloads
• Diagnostics

Lenovo

• Update Drivers, BIOS and Applications
• Diagnostics

Microsoft

• Popular Hardware drivers downloads

Malwarebytes

• Download Malwarebytes

Spybot

• Download Spybot

Defraggler

• Download Defraggler

Ultimate Boot CD

• Download Ultimate Boot CD

Hiren's Boot CD

• Download Hiren's Boot CD

There you go! These are the links that help me with my day to day life.