Witch - Welcome to the world of W. i. t. c. h.
Freeplane - Freeplane is a powerful and free software for building mind maps.
Hyperswitch - HyperSwitch provides a compelling alternative to HyperDock for keyboard junkies. What's New
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
Contexts - Switch between application windows effortlessly — with Fast Search, a better Command-Tab, a Sidebar or even a quick gesture. Free trial available.
SuperNotecard - Introducing SuperNotecard. SuperNotecard is an online writing tool that features virtual notecards to help arrange facts or scenes, track details, organize paragraphs, and clarify your composition process.