Add DockDoor (#1667)

Author: ejbills

README.md

@@ -1171,6 +1171,7 @@ Any comments, suggestions? [Let us know!](https://github.com/jaywcjlove/awesome-
 * [Amethyst](http://ianyh.com/amethyst/) - Tiling window manager. [![Open-Source Software][OSS Icon] ![Freeware][Freeware Icon]](https://github.com/ianyh/Amethyst)
 * [Assignee](https://assignee.app) - Simple, instant app switcher. [![App Store][app-store Icon]](https://apps.apple.com/app/apple-store/id1491598904?pt=120234215&ct=awesome-mac&mt=8)
 * [contexts](https://contexts.co/) - Provides more power than the native Mac Dock. Especially when you have multiple screens, it can help you switch more quickly.
+* [DockDoor](https://dockdoor.net) - Free and open source window peeking & alt-tab for macOS. [![Open-Source Software][OSS Icon] ![Freeware][Freeware Icon]](https://github.com/ejbills/DockDoor)
 * [Dockit](https://dockit-docs.pages.dev) - An application that can dock any window to the edge of the screen. [![Open-Source Software][OSS Icon] ![Freeware][Freeware Icon]](https://github.com/XiCheng148/Dockit)
 * [Dissolv](https://www.7sols.com/dissolv/) - Hide and close inactive apps. [![App Store][app-store Icon]](https://apps.apple.com/app/dissolv/id1640893012)
 * [Divvy](http://mizage.com/divvy/) - Window management at its finest with its amazing Divvy Grid system.