This script displays a dialog box for pre-composing one or more layers (like the built-in Pre-compose dialog box), but adds the ability to trim the pre-comp to the selected layer’s duration, with optional trim handles.

Use this tool to queue your comp with the work area set as a custom duration. This way you can set several work areas to one queue and render them all at once.

Isolates layers in your comp based on what modifier keys are held down. Adds a bug to the comp to indicate being in “Isolate” mode. Focus on the layers you want.

SaveCompAsProject is a script that, as it’s names says, export any of your composition as a new project.

Corner Cutters do the donkey work. You focus on the good stuff. A collection of utility scripts to make your life easier in After Effects.
Use the toolbar or use individual scripts in your own workflow.

The stereo 3d toolkit allows you to create complex stereoscopic compositions inside of after effects. It uses true left and right channels (instead of collapse transformations) so it is compatible with all 3d effects and plug-ins that use composition cameras.

Displays a palette with controls for changing the size, pixel aspect ratio, duration, and frame rate of the selected compositions, and all nested compositions (pre-comp layers) in it.

Uh, it creates reflections!

Quickly and easily crop a composition down to it’s contents. It can crop based on the current frame, all frames or a mask you create.

Creates a 3D environment for your After Effects compositions at the touch of a button. The environment then responds to your camera’s position, orientation, rotation and lens properties.

Creates a complete duplicate of a comp hierarchy including subcomps.

Search for effects used in your After Effects project. Find where specific effects have been used, turn them on or off, delete then, or link them together to create cloned effect instances.

Scale a composition and any nested compositions while maintaining the best available image quality.

Crop nested compositions to fit the image contents. Useful in cases like Photoshop imports where precomps are created as document size.

3D Widgets is a collection of scripts to make navigating the After Effects 3D space more intuitive.

Fits selected layers proportionally to fill the Comp frame by giving you the choice of either cropping or letterboxing.