On the Tools page you will find several (mostly free-/shareware) programs that can
assist you in making good plugins or audio/DSP programs. I can't promise that they
will be useful for everyone, but in my eyes they have a certain quality and should not
be underrated!
 

Okay, the first program is by me, but hey, this is my page :-)
Seriously, many people told me that this program is really useful for beginners in DSP
and filter design: it allows easy creation of FIR/IIR filters, shows you magnitude
and phase plot and lets you export them as Delphi or C++ classes.

Go to the FilterExplorer page
 

Yet another program by me :-)
This VST plugin allows debugging of the VST host-plugin interface, which is very
useful for both host and plugin developers. Many bugs have already been found
with this program in my own plugins as well as other (freeware and commercial)
hosts and plugins.

Kondor is part of the free UtilBag plugin collection!

Go to the Kondor/UtilBag page
 

TrentStitch is a simple, freeware program designed for programmers compiling bitmap
animations who need an easy way to take multiple bitmaps and stitch them together
into one really long or really tall bitmap. TrentStitch also allows you to set the color depth for the final image.

Go to the TrentStitch homepage
 

Jordan Russell's Inno Setup is a free installer for Windows programs that rivals and
even surpasses many commercial installers in feature set and stability. Easy to set up
and to use, and even the complete Delphi source code for this program is available!
This is also free for commercial use!

Go to the InnoSetup homepage