Coming soon: FTP, DHCP, TFTP servers in Python.
The Ultimate Hex Dump Utility. I wrote this somewhere around 1995 while doing a heavy amount of SNMP for a former employer. I've used the same hex_dump() function in just about every communications (network, serial, so on and so forth) program I've written since then. It's small, moderately useful, but I'm quite proud of it since it's the one bit of code I've carried with me for the last eight years and have hardly had to modify it.
Here's a sample "screen shot" of an hdump of the hdump executable built on Mac OS X.
00000000 fe ed fa ce 00 00 00 12 00 00 00 00 00 00 00 02 ................
0x000010 00 00 00 0a 00 00 04 bc 00 00 00 85 00 00 00 01 ................
0x000020 00 00 00 38 5f 5f 50 41 47 45 5a 45 52 4f 00 00 ...8__PAGEZERO..
0x000030 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 ................
0x000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0x000050 00 00 00 04 00 00 00 01 00 00 01 48 5f 5f 54 45 ...........H__TE
0x000060 58 54 00 00 00 00 00 00 00 00 00 00 00 00 10 00 XT..............
0x000070 00 00 20 00 00 00 00 00 00 00 20 00 00 00 00 07 .. ....... .....
0x000080 00 00 00 05 00 00 00 04 00 00 00 00 5f 5f 74 65 ............__te
0x000090 78 74 00 00 00 00 00 00 00 00 00 00 5f 5f 54 45 xt..........__TE
0x0000a0 58 54 00 00 00 00 00 00 00 00 00 00 00 00 23 c4 XT............#.
0x0000b0 00 00 08 a8 00 00 13 c4 00 00 00 02 00 00 00 00 ................
0x0000c0 00 00 00 00 80 00 04 00 00 00 00 00 00 00 00 00 ................
0x0000d0 5f 5f 70 69 63 73 79 6d 62 6f 6c 5f 73 74 75 62 __picsymbol_stub
0x0000e0 5f 5f 54 45 58 54 00 00 00 00 00 00 00 00 00 00 __TEXT..........
0x0000f0 00 00 2c 6c 00 00 02 d0 00 00 1c 6c 00 00 00 02 ..,l.......l....
0x000100 00 00 00 00 00 00 00 00 80 00 00 08 00 00 00 00 ................
[...]
Here's the source code. I've compiled and used it on: real mode embedded 8086, 80186, 80286; protected mode embedded 386, 486; 16-bit DOS, Win16, Win32, x86-Linux, x86-FreeBSD, HP-UX, Solaris, Sun-OS, MipsOS, NetWare; Embedded Hitachi H8S; and lately, Mac OS X. When embedding, I just chop off main() and use hex_dump().
I bought my house in October, 1997. For the last six years, I've been telling myself I would finally get the yard cleaned up, fixed up, and not uglying up my life. Summer 2003, I finally got to a point where I did it.
I still have work to do, especially in that back corner, but as the saying goes, progress before perfection.