A free program for Android, by NectarBits.
Picolag is the best collage maker and photo frame editor app. With a simple and intuitive interface, it’s easy to create beautiful photo collages in just a few seconds. The best thing about it is that it lets you combine multiple photos into one single photo, then you can share it on social media such as Facebook, Twitter, Tumblr, and many more! It lets you choose from a wide selection of stickers, frames, backgrounds, and filters, then you can add text and share it with your friends.
The best thing about Picolag is that it has a very simple interface, so you don’t need to download any other apps to create photo collages. It’s all done in one single app, so you don’t need to worry about compatibility issues.