Tweakgator.com

If you are looking for modified apps, the community generally recommends using verified sideloading methods rather than web-based "installers":

The site targets users who are:

She heard her front door lock click—not break, just re-key itself. Her phone screen lit up with a map of her city. Seventeen blinking dots. Each one, she realized with a cold thrill, was a person who had just visited tweakgator.com. tweakgator.com