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eWeek is reporting that use of Sun’s Cobalt OS, released as open source as the hardware line was retired this year, is experiencing an upswing.

The article details NetCraft results showing more than 900,000 sites using the Cobalt OS, up 47,000 since last year.

I used Cobalt servers between 1999 and 2002, and while I had some grievances with the platform, I must admit it was very convenient for mass deployment of web sites and ran reliably.

pkgmaster.com (www.pkgmaster.com), an important site for Cobalt users, provides the latest patches and appears to be staying alive post-Sun Cobalt. There is a link on the main page now which hints of a new enhanced Raq 550 interface system being built, obviously by someone other than Sun.