Kiwix is an offline reader for Web content. It's especially intended to make Wikipedia available offline. With Kiwix, you can enjoy Wikipedia on a boat, in the middle of nowhere... or in Jail. Kiwix manages to do that by reading ZIM files, a highly compressed open format with additional meta-data.
Searchmonkey is different to other desktop search engines. Users can search for file names and contents using powerful regular expressions. This enables Searchmonkey to be much more precise when it returns hits. In addition, searchmonkey doesn't just show you a list of files that might contain what you are looking for, it helpfully displays the content with the matches highlighted