A free program for Android, by Vint8 Studio.

Collage Maker Photo Editor Pro is a simple and easy-to-use app for creating beautiful collages from your photos in just a few minutes. You can choose from over 500 beautiful collage templates and create a masterpiece in seconds. And you don’t need any design skills or complicated editing tools to create beautiful collages. You can use your phone or tablet to create a masterpiece in just a few minutes. All you need is to take a photo or import photos from your camera roll, choose a template, customize it, add some stickers, texts, and decorations, and you’re done. And if you want to edit your photos even more, you can use professional editing tools such as blur, crop, opacity, and more.

Collage Maker Photo Editor Pro is a free app with no ads, so you can create a collage without any worries.