Free Developers' Kits?

[frascone]

Is there any free way to develop applications? Or, do I need visual studio or something?

Basically I want to make a really small app to do a common calculation that I do all the time. It's a simple app, so I don't want to spend any money on what would basically be a couple of math operations.

Thanks in advance

[Rudegar]

embedded visual stuio
is free i believe

[hanmin]

embedded visual c is free, together with the SDK for WM2003. It has a few problems (I have) (http://forum.xda-developers.com/showthread.php?t=321014) in getting it to work with the system stuff (e.g. clipboard), but for most cases, it works pretty well.