CloneMyKey
This service allows you to send your RFID tags and get them duplicated. Also have different form factors available .
Light Pollution Map
Map that shows you where the highest density of light is located. This allows you to pick a good place to watch the stars or satellites roaming the space above us.
Color’s
If you need to plan out a new project and need to select a color palette, this service allows you to try out and select multiple colors until you find what you like. For more options and gradients try out DopelyColors (thanks @dariusboundsUX)
Crontab Guru
Need to have a program or script running at a certain interval? Found the option to use crontab, but would like some help with the formatting? This is the service that will help you do that.
Homebridge
HomeKit is Apple’s solution for home automation. While their setup process if very simple, their line up and partners are on the lower side. This solution (paired with a RaspberryPi) allows you to use devices that are not HomeKit compatible on your HomeKit setup at home.
Thingiverse
Starting in 3D printing can be a bit overwhelming. If you just got your printer, go ahead and download a few pre-made models here and test out what your printer can do.