- Primary Color Correction in After Effects
- Secondary Color Correction in After Effects
- The Vectorscope in After Effects
- [later] Waveform Monitors in After Effects
Related AE Portal posts include: White balance + more with Color Finesse, Profiles and color management in AE, How to talk to a Colorist, and a review of the book Color Correction For Video by Steve Hullfish at AEtuts. See also Color Correction in Adobe After Effects CS3 by Mark Christiansen, an excerpt from his book that covers what you really need to know about Levels & Curves.
By the way, there are 2 other 3rd party plug-ins that provide good monitoring in AE (not in a modal dialog box), Synthetic Aperture Test Gear and Metadma ScopoGigio.
An interesting free Pixel Bender filter was posted on Video Copilot last year, Waveform Monitor by Peter Werner, shown below.