From the 'Essential Plug-Ins Guide' .pdf available on Digiidesign's website:
http://www.digidesign.com/index.cfm?...4&itemid=39831
The plug-ins included with Essential provide a
comprehensive suite of effects processing (such
as EQ, reverb, and delay) as well as the Structure
Essential virtual instrument.
The Essential plug-ins installed with ProTools
M-Powered Essential include:
• Click
• AIR Chorus
• AIR Flanger
• AIR Phaser
• D-Verb
• Dynamics III
• Compressor/Limiter
• Expander/Gate
• De-Esser
• EQ III
• 7Band
• 2–4Band
• 1Band
• ModDelay II
• Extra Long
• Long
• Medium
• Short
• Slap
• ReWire
• Sans Amp PSA-1
• Structure Essential
• Other DigiRack AudioSuite Plug-ins
• Multi-Tap Delay
• Ping-Pong Delay
• Reverse
Hope this helps : )