Popup windows: an overview of UX's least favorite UI element | by Justinmind | Prototypr
Illuminz - UX tip #31 While designing pop-up on mobile devices, shift the whole UI to bottom and use a full width popup with slide up the interaction for better user experience. . .
Pop-up, popover or popper? — a quick look into UI terms | by Shan Shen | UX Collective
Collect UI - Daily inspiration collected from daily ui archive and beyond. Based on Dribbble shots, hand picked, updating daily.
The Best Way to Use Pop-Ups (Modals) in Your Web Design