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Biferno is a new generation, Cross Platform Web Scripting Language.

Dabo is a 3-tier, cross-platform application development framework.

eCub is a cross-platform tool for creating EPUB and MobiPocket books.

Free, Open Source, Cross Platform RSS Aggregator for professional users

Alkaline is Cross-browser testing tool for web designers.

Is a GPL licensed, cross platform multitrack audio recording and editing suite.

CRON-O-Meter is free, open source, and cross-platform dieting software.

MetaMix is a cross between a musical compositionm.

Mars24 is a cross-platform Java application which displays a Mars "sunclock".

GanttPV - Project Scheduling Software (scriptable, cross-platform, open source)