CCleaner (formerly Crap Cleaner) is a freeware system optimization and privacy tool. It removes unused and temporary files from your system - allowing Windows to run faster, more efficiently and giving you more hard disk space. The best part is that it's fast! (normally taking less than a second to run) and Free.
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Foxit Reader SDK is a light weight, fast, clean software development kit for rendering PDF page contents in a wide range of applications.
Foxit Reader SDK is packaged in a DLL (Dynamic Link Library), which can be called from different programming languages, including C/C++, C#, Delphi, Visual Basic, etc.