Diptych, Triptych & Ntych Automation Tool For Photoshop – Tych Panel
Tych Panel is a free and open source Adobe Photoshop extension for automating the process of placing pictures side by side with pre-defined sizes.
It simplifies creating diptychs, triptychs, quadtychs and almost any type of custom layouts.
There is support for "Smart Objects" and, when enabled, all layers are converted to "Smart Objects" and get the appropriate layer masks.
The extension also comes with various other options like the ability to run actions, adding a background color to compositions and more.