From GameBrew - a wiki dedicated to Video Game Homebrew.
Spout is a small, abstract shooting game from Japanese developer kuni. It was originally written for a handheld LCD console, then ported to Windows/SDL, then to Unix/SDL and now to DS.
The goal is to get as high as you possibly can, without crashing or your time running out.
It plays somewhat like Finnish cavefliers, except you have to erode your surroundings with your ship's exhuast.
If you have a CF/SD FAT device then push any key other than B to attempt to use it. The score and height will be saved to "spout.sco". There is no way to detect current folder, so for now it's saved to root.
A/B/X/Y - shoot, accelerate, spout, start
left - turn left
right - turn right
start - pause
select - LCD swap
L - toggle top backlight
R - toggle bottom backlight
For use on emulators, GBA flashcarts and WMB, start the game with the B button. If you have GBA flashcart, the game will be saved to SRAM, so backup any important save games before running Spout.
SpoutEX - An extended version of SpoutDS. Supports motion card and more.
Spout Windows SDL version - original Japanese site