Here we have some some AAC encoders based on FAAC as well as tools to deal with AAC and mp4/m4a files.
FAAC is a command line AAC/MP4 audio encoder for Win32. This version modified to permit up to 320kbps encoding.
Library version of faac, usable on some CD rippers and frontends. Version 1.28 modified to permit up to 320kbps encoding.
This CoolEdit Pro/Adobe Audition plugin does importing and exporting of AAC/MP4 streams, using FAAC 1.28 and FAAD2 2.7. Unzip the file to CoolEdit/Audition's folder.
This Winamp plugin does exporting of AAC/MP4 streams, using FAAC 1.24
Command line ReplayGain tool for MP4 and M4A streams based on mp3gain. This release includes the following changes: Fixed a bug in mp4v2 which caused iTunes music video files to fail with "not a valid mp4/m4a file" error. Gives a more meaningful error message when attempting to process Apple Lossless files (which are still not supported by aacgain). Built with updated mp4v2 and faad2 code. Built with latest mp3gain version 1.5.2, which includes id3v2 tag support. See the included README file for more info. By Dave Lasker.
A front-end for AACGain to enable it to work better with iTunes. Win32 only (no Mac port available). It is packaged as a Microsoft Installer (.msi) file which also installs aacgain.exe. (This updates the version of AACGain packaged with the iGain installer to version 1.9. No changes were made to iGain itself.) By Dave Lasker.
A command line tool to automate encoding of WAV files to AAC through Apple iTunes. By Otto42