Cppcheck is an analysis tool for C/C++ code. It detects the types of bugs that the compilers normally fail to detect. The goal is no false positives.
Frhed is an binary file editor for Windows. It is small but has many advanced features like ability to load big files partially.
WinMerge is an Open Source differencing and merging tool for Windows. WinMerge can compare both folders and files, presenting differences in a visual text format that is easy to understand and handle.
NOCC is a webmail client written in PHP. It provides webmail access to IMAP and POP3 accounts.