IRCAM directory of Max objects:Downloadable Max externals.
Bill Orcutt's Max/MSP Externals: Includes a shell object, a mySQL client, and other utilities.
Bomb: A visual-musical instrument.
Boot Squad: Several maxlets (apps written using MAX, MSP and NATO). Also hosts most recent version of NATO modular reference utensil.
CNMAT MAX Work: Patches and Objects from UC Berkeley's CNMAT
Eric Singer's Max Patches: AiffPlayer, Text-to-Speech, a CD clipper and video.
FFTease: Max/MSP objects for spectral processing. Includes additive-synthesis phase vocoder, noise reducer, cross synthesis.
Joshua Goldberg's Max/MSP/NATO page: Links, patches, externals and apps.
Listlib by MMyneta: List objects
Lobjects by Peter Elsea: FTP-site for download of Lobjects, Peter Elseas collection of externals for dealing with lists.
Max/MSP Externals: Phase aligned formant synth, computation of spectral centroid, pitch follow, sinusoidal decomp, percussion follower.
MaxMSP Objects: by Eric Lyon.
MegaMAX: A collection of user interface objects and other externals for use with Opcode's MAX programming environment.
PeRColate: Collection of synthesis and signal processing objects for Max/MSP. By Dan Trueman and R. Luke DuBois.
Real Time Composition: Patches for MAX offering compositional techniques like serial procedures, permutations and controlled randomness.
Trond Lossius (Bergen senter for elektronisk kunst): Objects for Max, list operations, MIDI, MSP and Nato modular.
VBAP: Vector Base Amplitude Panning, objects for multi-channel 3-D sound