10 minutes mail
You can get a temporary email address for 10 minutes. You can use it to sign up for a service not worth using your real email address. You can extend the time. There are many similar services.
PDF compressor
Sometimes, lazy people send large PDF files to you. You can compress it with this service. There are many similar services, but this one is my favorite.
PDF Resizer
You can edit PDF files in many ways with this service. Cropping is one of the useful features.
Internet speed test
You can check your internet speed.
LettuceMeet
You can schedule a meeting with your friends.
Online timer
Online timer with simple UI.