The most widely used plugin for this task. It offers a "pay-what-you-want" model, allowing for a to verify functionality. It supports bulk un-precomposing and attempts to correct layer placement even when randomized expressions are present. Official Sources: aescripts.com or BatchFrame.com . Compatibility: After Effects CC 2018 through 2026. AEUX (formerly Googleux)
If the specific goal is to un-precompose shape layers, the "Explode Shape Layers" script is a free and highly popular tool. It takes a shape layer with multiple groups and separates them into individual layers—functionally similar to un-precomposing for shape layers. un-precompose free download