Keyman Desktop is a multilingual virtual keyboard application.  It enables a user to type in any of over 600 languages in Windows, Mac OS, Android iOS, and Linux. Designed with the user in mind, it is the market-leading keyboard mapping solution. Well-supported across many operating systems, it brings a simple solution to the complexity of typing in a range of languages and scripts that are either unsupported or only partly supported by the operating system.   Some key features of "Keyman Desktop" are:

• Keyman Contextual Input Method
• Multiple keyboards at any one time
• Automatic configuration of language options
• Diagnostic Tools
• On-Screen Keyboard
• Uniscribe text rendering
• Windows Language Integration
• Text Services Framework support
• Full support

Keyman is now free and open source. Keyman 10 (that installs unlimited keyboards, lets you define keyboard hotkeys and configure Keyman to start automatically) is now free to anyone.  The Keyman website lets you search for existing keyboards in many different languages.  Keyman 10 is the latest version. Keyman Developer (also free) can develop keyboards for mobile devices as well as desktop and laptop computers.