If you're a developer, devdocs.io is clutch as fuck.
If you Like consuming media but not expelling money, fmhy is lit af
Unlimited sound generators at MyNoise
Here's a bunch of useful online tools
Trying to find someone? Try the tools here
Track Awesome List tracks a ridiculous number of Awesome lists on github.
I'm sure there's more, these are just the ones that were on the top of my head