A free program for Android, by Bryan Lee.

Photo Collage Maker is an amazing photo collage app. It lets you combine multiple photos into a single, beautiful picture. Simply choose a layout and customize it with filters, stickers, and text. 

How to use it?

Choose a layout you like, customize it with filters, stickers, and text, and then share it on Instagram, Twitter, and Facebook. You can also add text to your collages. Choose from a variety of layouts, backgrounds, and stickers. And you can combine multiple photos into a single, beautiful picture.