Hook API SDK
Hook API SDK is a Software Development Kit for easy and quickly develop Windows System Wide API Hooking program. It helps you hooking Windows system functions or functions in 3rd applications, this means you can call your own functions instead of some Windows system APIs or functions of other...
http://www.hook-api.com/hooking-api.zip - 259Kb - Download - Screenshot

ChooseColor Development Kit
ChooseColor Development Kit is an extensible component/dialog box for Win32 platforms that provide comprehensive solution for your modern user interface needs. Color dialog box provides complete customization that you can use to extend its functionality. ... Written entirely in API C ChooseColor is small, reliable, efficient and provides easy to use component for you and your end-users. ... ChooseColor includes complete HLS editor, flicker-free drawing, predefined web colors listed in "HIVE" control, API interface for developers and much more.
http://www.slugen.com/clrdlg/download/clrdlgt.msi - 265Kb - Download - Screenshot

SDProtector Pro
SDProtector is a powerful tool offering both software developers and distributors a protection of software products against unauthorized copying, use and distribution. SDProtector was designed with ease of use and high speed as a priority without sacrificing high levels of protection. ... In addition, it uses RSA 1024 algorithm, API functions, new anti-debug tricks, active protection against dumping from memory and tracers. ... With SDProtector it's easy to turn your application in "try-before-you-buy" versions with little effort, offering everything to guarantee a maximum protection...
http://www.sdprotector.com/pro_setup.exe - 793Kb - Download - Screenshot

PECompact
PECompact compresses Windows modules (EXE, DLL, SCR, etc.. ) substantially, while leaving them able to be run just as before. At runtime, compressed modules are rapidly decompressed in memory.
http://bitsum.webix.net/pec2student.zip - 914Kb - Download - Screenshot