I've found myself in need of a lightweight built-in (-ish) editor for SQLITE databases. These databases are used by a large variety of free and paid software on OS X since sqlite3 is bundled into Mac OS. Not having found any, I wrote one.
In the interest of completeness I'd like to find a few guinea pigs that would be interested in bug testing it. (and to let me know of any obvious missing features)
It's ~ 2500 lines of BASH and has an ANSI graphics interface that should remind you of DBASE if you ever used that on the PC. (that's where my first database experience comes from) Let me know if you're interested in playing with it. Only very basic understanding of terminal use is necessary and NO understanding of SQL or databases is necessary. It's about as easy to use as Excel.
Although I know there's a lot of titles that use it, I don't know of much actually bundled with OS X that uses it. I was thinking safari for bookmarks, history, cookies, etc but I don't see it. A lot of titles use Defaults (prefs plists with arrays and dictionaries) instead for things that really belong in a database. (apple's remote desktop! all in a plist, even the password list. wow....) So if you know of any "easy targets" to test with also let me know.
it's now 4,000 lines and has features like "search" and "sort"