OStatic

In October, Mozilla witnessed a surge in Firefox 3's market share as it continued its plan to decommission Firefox 2 -- and the Gecko engine that powered it -- before the end of December.

For two weeks in October, Firefox 3 claimed 20% market share, something that web metrics company Net Applications predicted might happen within a month of the new version's June release. Stalled growth, and Chrome's appearance caused some backslide, but Firefox 3's pulse is getting stronger.

Upgrades in the world of commercial software are typically forced upon users, and often contain unpleasant surprises. Users of open-source languages, databases, operating systems, and applications can't be forced to upgrade, and there is no financial incentive for the developers to get everyone to use the same version.

We look at several popular open-source languages and tools, to understand just how upgrades and compatibility are ensured in a world of open options.