KbdTray
Display keyboard layout in the system tray.
This utility may be used as standard language bar replacement, which has some bugs on XP (occasionally loses position, increases taskbar height). The language bar should be disabled in "Control Panel" → "Regional and Language Options" → "Languages" → "Details…" → "Language Bar…" → uncheck "Show the Language bar on the desktop" (disabling it via toolbar menu may cause language bar to show again after logout).
Download: kbdtray-1.0.7z
SysTrayUtil
Preserve system tray icon order.
Note, that this program doesn't allow to move icons, it only preserves the order! Here are recommended programs to move them:
Taskbar Shuffle — Drag taskbar items and tray icons.
Shell Tray Info — Display system tray information, move icons using buttons within program's window.
Download: systrayutil-1.1.7z
WPA Supplicant
Manage wireless network connections. WPA/WPA2 supplicant.
This program is useful on XP SP1/SP2, which don't support WPA/WPA2. It has supplicant service and GUI utility to manage connections.
There are some alternatives, like (probably the most shilled here) Boingo Wireless, but they all are proprietary and have ugly GUI. I was surprised to find that WPA Supplicant was maintained for Windows decades ago, but faced some problems when tried to use it. So, it's not my project, I just added some bug fixes and cosmetic patches. All these patches are included into the archive.
Download: wpa-supplicant-0.7.3.7z
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I made/modified these programs just for fun. I doubt I'll seriously maintain them, but I thought they might be useful for someone here (it seems to be a pretty large XP users community).
There is README.txt file in all archives with further instructions to install programs or build them from the source code (included into the archives). All links are archived on web.archive.org (just in case somebody will want to use these programs in 2030, who knows).
I didn't try to use these programs on Windows 2000, but they probably will work.