A few scripts I have written for Photoshop. 

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• Sync Masks: Looks for a "keyword" in [brackets] in selected layer's name. Then copies Layer or Vector mask to other layers with the same [keyword]. This is to help keep masks in sync when creating grunge masks or material IDs across multiple layers. 

• SaveAs from Clipboard: Saves image data that you have copied to your clipboard.

Photoshop Actions

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• Center Guides: Places a guide horizontally and vertically at the exact center of the document. Useful for tiling textures or making alphas/matCaps for Zbrush
• Find Center of Selection: Places a horizontal and vertical line shape at the center of whatever you have selected. Useful for finding the center of a complex or organic selection.
• Expand/Contract 1px/5px/10px: These are bound to function keys to quickly expand or contract a selection. Very useful for overpainting textures or making boarders.
• Make 1024 / 512 / 256: Resizes the document to noted size. Useful for batch down-scaling textures
• Reduce Image/Layer by 50%: Scales the layer or whole canvas by 50%. 
• Flatten & Copy to Alpha: Copies the current state of the document to the alpha channel. 
• Paste Mask to Alpha: Copies the active layer mask to the alpha channel. Useful for converting a grunge mask to alpha. 
• R / G /B Group: Creates a group that clamps any layers in it to the R, G or B channel. Useful for creating packed / material / rmao textures. 
• Mirror Marquee X / Y: Flips the selection marquee along the x or y axis. 
• Dup & Repeat Transform: Duplicates the layer and repeats the last free-transform. Useful for arraying in a circle or equally spacing layers.