A free program for Android, by TarrySoft.
Photo Collage Maker: Photo Collage Frames Editor is an easy-to-use application that allows you to make a collage from your favorite pictures in just a few minutes.
All you need to do is to take a photo from your device, choose a grid size and a photo frame, and you’re ready to save it. The best part is that you can use many different layouts and backgrounds, as well as add different elements, such as stickers and text.
If you want to create a collage for a special event, such as your wedding or birthday, you’ll be able to do it in less than 2 minutes.
The app has a powerful photo editor that allows you to apply different filters, add text and stickers, and even change the background and layout.