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Jollat is a cross-platform graphical client for Amazon Web Services

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

A real-time, cross-platform, powerful and easy to use group scheduler.

Professional level cross-stitching and charting application.

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

Master Grade, the next generation in cross-platform teacher gradebook 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)

Peer-to-peer, cross platform in/out staff tracking for LANs and the Internet.