FireBird is a spinoff of Borland's OpenSourced InterBase. See the 
Firebird sourceforge page.
It was much lesser known before Mozilla.org's decision to rename their browser from Phoenix (which conflicted with the Phoenix BIOS trademark) to FireBird after months of research. Uproar ensued, and Mozilla.org renamed their browser MozillaFirefox.
One page links to FireBird:
