JayMSA

JayMSA is a modernized version of the Magic Shadow Archiver. It offers all its functionality, also supports .ST files and allows you to browse the contents of disk images.

It is full replacement of the MSA 2.3+ and has many new features:

   * Works with HD floppy
   * Browse directory
   * Extract selected file(s)
   * View file direct from MSA archive
   * Fast LZW compression is available
   * PaCifiST .ST files support
   * Document history protocol support
   * FCopy .DIM format added
   * New Fixed a memory allocation bug preventing it running in MiNT
   * New Now as Freeware

You can find it at http://jaysoft.atari.org/.