Keyboard Layout Manager is shareware and needs registration. Lite version Medium version PRO version. Lite version disables AltGr key and all diacritic characters during saving. Medium, Pro and 2000 versions preserve all diacritic characters. If you want to edit diacritics, you must use Pro or 2000 versions.
Lite version disables all ligatures during saving.
Medium, Pro and 2000 versions preserve all ligatures. If you want to edit ligatures, you must use 2000 version. There is a 2000 demo version which demonstrates the possibilities of a normal 2000 version. The only difference is that the save option is disabled. Look at the download page.