I made a shmup engine from scratch a few weeks ago. The quirks have been ironed out and it's ready for a general release.

Feature List | Download

Converts an installed copy of Umineko EP 1~6 to a version playable with VNDS. If you encounter any bugs, please report them in the VNDS forum.

Changelog:

 * 2010/07/31 -- v1.1.3
 - Support for EP6
 - Converter would sometimes mistake EP1-4 for EP5+

I was having some problems with the Vorbis SPI (JavaSound plugin) from javazoom -- it cuts off silence at the end of vorbis audio. It also closes its input stream when reaching the end of the audio, requiring a nasty hack to support looping playback.

At the same time, I was also looking for a way to play video's from an unsigned applet. Luckily, adapting Cortado solves both my problems. It includes 100% Java implementations of Ogg/Vorbis/Theora decoders. I ripped out the decoders and added my own code for time-accurate seeking and stream synchronization.

Writing a new Vorbis SPI was quite easy once I had a fully functioning Theora player.

Google code project page

This is a customized version of Lua (5.1.4) that uses 20.12 fixed point instead of double for its number type. The main reason for this change is to speed up arithmetic (the DS doesn't have an FPU). Keep in mind that the change in number format limits the usable range to [-2¹⁹, 2¹⁹)

Included in the tools folder are a replacement math lib which uses lookup tables for trig functions and a Haskell script. The script takes a sanitized C header file and generates the required code to export those functions as a Lua library.

Changelog:

 * 2010/01/13 -- v1.05
 - Support for EP5
 - Looping sound effects don't cause
   delay commands anymore
  
 * 2009/12/28 -- v1.0.4
 - Experimental support for EP5