Not a great development tool by any means. Some businesses use it because it's easy for end-users to learn its command-mode functions, and because it works cross-platform on PCs and Macintoshes. The new version (rel. 4) lets you serve your database application up on the web, assuming you can put the software on your web server.
My favorite development tool, which I've used professionally and personally for years. More links to come, eventually!
The old stalwart standby, where much of my research data still resides.