OSX Bytes
iFileX
FreeOS X file search that can look at hidden files and file contents.
MacPhoto Batcher
Trial versionBatch processing for photos.
MaciLock
Trial versionPassword protect any OS X application from unauthorized usage.
MaciSonics
FreeConvert any audio format to all popular audio formats.
MaciTrash
Trial versionUninstall programs using the Levenshtein Distance algorithm to find related files.
MaciTweaX
FreeAlter hidden features in OS X.
Mac