Here's a few tools that are helpful when building or managing websites, or just generally doing business online.
FreshBooks does things you can’t do on an old ledger or in Word and Excel. It automates invoicing, like actually filling them out and sending them for you. It also keeps track of your expenses. Like a friendlier version of Quickbooks.
ICANN Whois Search
https://whois.icann.org
Find out where a domain name is registered and (if not private) by who.
Have I Been Pwned
https://haveibeenpwned.com
Check if you have an online account that has been compromised.
Google Fonts
https://fonts.google.com
Share and integrate typography into any design project seamlessly.
Optimizilla
https://imagecompressor.com
Shrink JPEG and PNG images to the minimum possible size.
Pixlr
https://pixlr.com/x
Online photo editor (no download required) for basic image editing.
Wayback Machine
https://archive.org/web
Archived snapshots of websites going back to 1996.