AltTabAlternative!

VistaSwitcher is an elegant and powerful task management utility for Windows OS. Once installed, it replaces the default Windows Alt-Tab dialog with a nice box that shows a list of all running tasks, with their names and preview snapshots, and enables the user to take actions on them using the mouse and keyboard shortcuts. With just one click, you can switch tasks, minimize, maximize, restore the main window, or close the process.

Contexts is built for speed. The interface always responds instantly so you can always remain in flow.Applications without windows are also listed. Because you should never have to think about whether an app has an open window or not.

Command-Tab Plus Is a Powerful and Customizable macOS App’s and Windows SwitcherCommand-Tab Plus is designed to help you switch between apps and windows in a faster and more convenient way. A great alternative for Mac App’s switcher.

TaskSwitchXP is an advanced task management utility that picks up where the standard Windows Alt+Tab switcher leaves off. It provides the same functionality, and adds visual styles to the dialog and also enhances it by displaying thumbnail preview of the application that will be switched to.

Manico is a fast application switcher for Mac that lets you access apps by simply holding the Option key and pressing the target number.

If you are not familiar with the Alt-Tab task switcher in Windows, its a keyboard short-cut (hot-key) to enable fast switching between applications/windows. This feature has been in Windows since Windows 3.0 and is largely unchanged since Windows 95! Alt-Tab Thingy is a replacement to add brand new features to help you switch tasks faster and more efficiently than ever before!

LiteSwitch X follows the tradition of LiteSwitch as a simple solution for managing open applications using the keyboard. Like its predecessor which will continue to be available, LiteSwitch X has a clean, simple and functional style that has become Proteron's hallmark. It features an aquified transparent, resizeable window which is invoked by a configurable key-combination (default is Apple-Tab). From the pop-up window the user can switch to any application, hide, quit, or force quit any application or drag-and-drop files onto any application. Windows users migrating to the Mac can feel more at home having the Alt-tab functionality returned to them, yet enjoy it in its full Mac OS X splendor. »

With SpaceLauncher for macOS, you can launch or switch to an app by pressing a pre-defined key while holding down spacebar.