Open Source Alternative to Dreamweaver's .LBI?

An anonymous reader asks: "I have recently started using Dreamweaver to manage one of many websites that I work on. One feature that I am growing to love is the ability to use Dreamweaver library files (.LBI). What are Slashdot readers' opinions on this format? Is there something better (read: free and standards-compliant)? I also would like to find something I could use on an open-source platform so that I won't be locked in to using Dreamweaver. What do you use for your sites?"