SSC, Inc.
Assembler Rexx functions for dynamic concat, PDS functions, sleep, WTO(R). http://www.sscmainframe.com/freeware.htm
CMS/TSO Pipelines
Data flow programming with REXX integration. http://www2.marist.edu/~pipeline/
Planet MVS
OS/390 freeware and mainframe-related topics by Dave Alcock. http://www.planetmvs.com/
Tek-Tips: REXX Technical Help Forum
REXX technical support forum and mutual help system for computer professionals. http://www.tek-tips.com/gthreadminder.cfm/lev2/4/lev3/32/pid/277
SEC
Includes external Rexx functions, STEMPUSH/STEMPULL, LISTSYM, LISTMEM and SLEEP. MXI system info is also Rexx-callable. http://www.secltd.co.uk/
MvsHelp.com
Has a REXX/CLIST/TSO discussion group. See "Help Boards". http://www.mvshelp.com/
FAD-H Software
TSO/REXX functions - DSLIST replacement, global variables and dynamic allocation. Also some TSO utilities. http://www.btinternet.com/~ashleys/fadh_software.htm
ISPF-L
Mailing list archives, search, and subscription services. http://listserv.nd.edu/archives/ispf-l.html
TSO-REXX
TSO Rexx discussion list, archives and subscription. http://vm.marist.edu/htbin/wlvindex?TSO-REXX