As Here Drive+ and Here Maps are still absent from the Windows Store.HERE somehow managed to have fixed the bug which was blocking Here Transit App.
Here Transit is the only HERE app available at the moment, the app is searchable and downloadable on Windows Phone 8.1 devices, but is still missing for Windows 10 Devices.There is no Statement from HERE regarding the availability of other apps on Windows Phone 8.1 and Windows 10 Devices.

Click here to Download Here Transit for Windows Phone 8.1 Devices