This message announces the availability of Scheme release scm-5f4. SCM conforms to Revised^5 Report on the Algorithmic Language Scheme and the IEEE P1178 specification. SCM is written in C and runs under Amiga, Atari-ST, MacOS, MS-DOS, OS/2, NOS/VE, Unicos, VMS, Windows, Unix, and similar systems. SCM is free software and part of the GNU project. It is released under the GNU Lesser General Public License (LGPL). Documentation and distributions in several formats are linked from SCM's home page: SCM source is available from: Also available as binary RPM: Also available as MS-Windows installer (older version): SLIB is a portable Scheme library which SCM uses: Also available as RPM: Also available as MS-Windows installer: JACAL is a symbolic math system written in Scheme: Also available as RPM: Also available as MS-Windows installer: WB is a disk based, sorted associative array (B-tree) library for SCM. Using WB, large databases can be created and managed from SCM. Also available as binary RPM: FreeSnell is a program to compute optical properties of multilayer thin-film coatings: Also available as MS-Windows installer: SIMSYNCH is a digital logic simulation system written in SCM. XSCM is a X windows interface package which works with SCM: TURTLSCM is a turtle graphics package which works with SCM on MS-DOS or X11 machines: #! implements "#!" (POSIX) shell-scripts for MS-DOS batch files. SLIB-PSD is a portable debugger for Scheme (requires emacs editor): MacSCM is a Macintosh applications building package which works with SCM (similar to XSCM). Programs for printing and viewing TexInfo documentation (which SCM has) come with GNU Emacs or can be obtained via ftp from: