CloneManager allows to find duplicate files, and those which haven't been backed up. It may skip files based on size, and use directory structures for search grouping. It's implemented in Java and available in English and French.
grec is a search tool similar to grep. Instead of just matching text its purpose is colorizing output lines. By specifying a regex and a simple color name/scheme it can display matched results from e.g. a shell pipe. It takes care to not misinterpret distinct regex matches with colorization areas.