Ztools, the Infocom Toolkit by Mark Howell, currently maintained by Matthew T. Russotto.
Ztools contains the following tools (as of version 7/3.1, 07nov98):
check - checks story file integrity, same as $verify command. Works on all types except for V1, V2 and early V3 games which have no checksum in the header. Optionally outputs a new story file of the correct length.
infodump - dumps header, object list, grammar and dictionary of a given story file. Works on all types. Grammar doesn't work for V6 games yet.
inforead - converts IBM bootable disks to story files. Only for IBM PCs, requires Microsoft C or Borland C.
pix2gif - convert IBM MCGA/VGA (*.MG1) picture files from V6 games to
individual GIF files, viewable on most platforms.
txd - disassembles story files to Z code assembly language, plus text strings. Works on all games from V1 to V8. Also supports Inform assembler syntax.
Some of the executables in this directory contain older versions of Ztools which may not support all of the game files mentioned above.
Infocom Toolkit by Mark Howell, probably version 14apr93, ported to the Apple IIGS by Matt Ackeret. Runs under Orca or GNO or any compatible shell. Packed with ShrinkIt.
Mark Howell's TXD (and some associated Ztools) ported to the Macintosh by Grey Lowell. Fat binary for 68020 or better and PowerPC.
txd (27jul96, version 5/10) for the Macintosh, ported by Robert M. Dickau.
Description of mactxd.sit.hqx.
Ztools version 7/1 compiled as Macintosh MPW tools by Matthew T. Russotto.
OS/2 executables version 7/2 (03aug97); ported by John W. Kennedy. OS/2 Warp executable, OS/2 source code, and the original source.
Ztools portable source code version 7/3.1 (07nov98) for Amiga, DOS, Mac, Unix and VMS.
(For modern compilers, you probably want ztools731a.zip instead.)
MSDOS executables version 7/3.1 (07nov98), built by Steve Nickolas. Archive includes 16-bit (built with Watcom) and 32-bit (built with DJGPP) executables.
FreeBSD executables, version 7/3.1 (07nov98).
Mac OS X executables version 7/3.1 (07nov98), compiled by Brad Town.
RISC OS executables version 7/3.1 (07nov98), ported by Kevin Bracey.
Win32 (Windows 95/98/NT) executables version 7/3.1, ported by Kirk Klobe.
This is a version of the ztools source updated for modern C compilers. The functionality is the same as version 7/3.1 (ztools731.tar.gz); it's just easier to compile now.
(For older 1990s platforms, you may want ztools731.tar.gz instead.)
Amiga executables version 7/3 (07feb98), ported by David Kinder.
BeOS executables version 7/3 (07feb98), compiled by Stephen van Egmond. PowerPC and Intel x86 versions included.