Apps similar to Key Manager include AutoHotkey, which is free and open source. Other options are X-Mouse Button Control, FastKeys, SharpKeys and Karabiner Elements. There's no shortage of Key Mapping Tools like Key Manager, with more than 50 alternatives for Windows, Mac, Linux, Android and the web.
AutoHotkey is an open-source Windows scripting language for task automation. It crafts scripts for operations like form filling and auto-clicking, initially starting with hotkeys yet evolving into a complete script language. Converts scripts to executables, works offline, and supports debugging.
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X-Mouse Button Control is a Windows application to remap your mouse buttons and expand the capabilities of your mouse!
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All in one Windows automation software. Fully configurable text expander, start menu, shortcuts, auto complete and mouse gestures. User-defined commands to run files, open webpages, send macros or automate anything. Incredibly powerful but yet simple to use.
SharpKeys is a utility that manages a Registry key that allows Windows to remap one key to any other key. Included in the application is a list of common keyboard keys and a Type Key feature to automatically recognize most keyboard keys. It was developed in C# using .NET v2.
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Karabiner, previously called KeyRemap4MacBook, is a very powerful keyboard remapper for Mac OS X. In addition to simple key remapping, it has special remapping modes like Emacs-mode, SandS-mode (Space and Shift).
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Clavier+ allows you to create global keyboard shortcuts for launching applications, opening folders, writing text and opening websites.
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AutoKey, previously known as AutoKey Py3, is a Python 3 port of the discontinued OldAutoKey , the desktop automation utility for Linux and X11.
This is a tool for powerful automation of OS X. At its core, Hammerspoon is just a bridge between the operating system and a Lua scripting engine.
Repeat is a full-fledged, Java mouse/keyboard record/replay and automation hotkeys/macros creation using modern programming languages, and more advanced automation features. Working across three major OSes: Windows, OSX, and Linux.
An entirely open source driver and user-space daemon that allows you to manage your Razer peripherals on GNU/Linux.
Piper is a graphical user interface to configure gaming mice. Configuration options include changing the resolution (DPI) of the mouse, adding and removing profiles, setting LED colors and changing button behaviors.
KeyTweak is a free keyboard remapper for Windows NT/2000/XP/Vista/Win 7. It makes use of Microsoft's Scancode Map registry key to remap your keyboard.
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