This was a Puppy by forum member Iguleder.

Next Puppy is based on Puppy Squeeze, a Puppy built using binary package of Debian's stable branch.
Thread: http://murga-linux.com/puppy/viewtopic.php?search_id=314215473&t=70758

Here is what it came with..
Next Puppy ships with an assorted collection of snappy applications that leave you with no doubt that your hardware's true power is unleashed:
- Linux kernel 2.6.39.4, patched with the BFS scheduler by Con Kolivas to improve performance.
- The Window Maker window manager, which implements the the elegant NextSTEP user interface.
- The Firefox web browser.
- Sylpheed, a small e-mail client and news reader.
- Transmission, a small BitTorrent client.
- emelFM2, a small two-pane file manager.
- Leafpad, a minimalistic text editor.
- rxvt-unicode, a tiny terminal emulator.
- Xarchiver, a small archive manager.
- DeaDBeeF, a lightweight music player.
- rgbPaint, a basic image editor.
- MPlayer, a media player.
- Feh, a minimalistic image viewer.
- Zathura, the smallest PDF document viewer there is.
- Aumix, a small volume mixer.
- scrot, a screen capture tool.
- Trayfreq, a processor frequency and better monitor.

Note that Next Puppy lacks certain applications that are present in official releases:
- A word processor and a spreadsheet application: Abiword and Gnumeric could be easily stuffed in 2 to 5 MB, but they're not needed when comparable web applications exist. Also, most people with office needs would prefer LibreOffice.
- An IRC client; the main use for an IRC client in Puppy is its IRC channel, but it's available through Web IRC, too.
- A contact manager and a password manager: both introduce security and privacy risks, so they're not included.
- A download manager: modern web browsers ship with sufficient download managers so a separate application is nothing but duplicate functionality that harms the one-application-per-task philosophy. 

Has Windowmaker Look and feel.