Available for Android and iOS until now, SwiftKey is ready for Windows 10. Windows Insiders in the Fast ring and those who opted in to Skip Ahead can use this popular virtual keyboard app in Windows 10 Insider Preview Build 17692. The list of languages supported includes English, French, German, Italian, Spanish, Portugues, and Russian.
https://www.notebookcheck.net/Virtual-keyboard-SwiftKey-coming-to-Windows-10.308958.0.html