A few ISPF or OS/390 Tools and Toys: ISPF extensions, development aids and system information. By Doug Nadel, ISPF developer.
BGD Software: REXX edit macros and utilities.
Bill Lalonde - Big Iron: REXX Sample Code for OS/390.
Capitalware's Sample OS/390 Code: Various Rexx, CLIST, C and assembler programs.
CBT Tape: MVS freeware repository. Has lots of Rexx code, too.
Dave's MVS freeware - Rexx: System-oriented execs.
David McRitchie: The REXX Macros Toolbox: For TSO ISPF and SPF/PC users.
Frank Clarke: REXX/MVS code examples and utilities: Building blocks and utility routines.
GSF Tools & Docs: A system programmers toolkit by Gilbert Saint-flour. Includes information on VSAM support in Rexx.
ISPF Edit macro examples: Extra commands for edit.
Joanna Gordon: Includes sample ISPF application for IMS online image copy utility.
LDW's Quick and Dirty MVS Page: Includes some Rexx utilities.
Lionel B. Dyck: OS/390 Freeware page includes ISPF and REXX related tools and toys.
Mark's MVS Utilities: Large collection, mostly written in Rexx or CLIST.
Rock Painter: Mainframe Rexx Examples
Roy Gardiner: ISPF tool, Dataset Display Facility. Utility actions on remembered dataset list.
TSO Times: from Chicago-Soft. Back issues contain several Rexx utilities.
TSO/ISPF Update: Quarterly journal from Xephon. Archives contain lots of REXX code.
VMCMS.com REXX Programs: KEDIT macros, object REXX, Winrexx utilities, REXX utilities, and time and date functions.
z/OS Unix Tools and Toys: Includes Rexx function package with stream I/O commands, file services, environment variables and immediate commands.