By Ampere Metal - This program (both 64 and 128 version on disk) will dissolve MS-DOS archives (.arc) files. According to the docs on the disk, it will also work with ST and Amiga based archives.

Released by Mad Man Software Inc. by Gene Barker. Decomper is a decompressor for files that were created using the CKit 94 compression utility.

Disk Masher 64 v1.0 by Donncha Ó Caoimh is a full disk archiver similar to zipcode.  There are docs on the disk and here is the programmers blog with a nice write-up on the program 

 https://odd.blog/2012/02/22/the-commodore-64-disk-masher-c64-dms/

Written by John Leeson. This disk contains two utilities; squeeze and unsqueeze. SQ and USQ are programs usually used in conjunction with uploading and downloading programs and text files to or from a computer BBS over the telephone. The program SQ makes programs or other files smaller so it takes less time to send them. USQ is the matching program that restores the original program or file after someone else downloads it. Docs on disk.

Written by Ray Kelm of New Image Software (The BBS), Image Packer is a simple but amazing archiver. With only 3 blocks of ML, Image packer will take several files (Not REL's) and compress them into a single file that when run will decompress the contents.

LHX64 will extract / decompress LHarc files (.lha).

AM warez exchange released this tool in October 1987. This is a two drive disk compress / un-compress pair of programs. Apparently the code was actually written by ESI and spread by AWE.

Spyne is a program that can create a self extracting archive of up to 144 files and 65535 disk blocks. There are also 2 other utilities in this package called Splice and Join that can create/extract archives (not self extracting) from up to 10 files.