Justin Blackwood of BlackwoodApps has released two additions to the VirtuaScore line of virtual sports scoreboards, Tennis and Volleyball.

The Mac OS X apps are targeted to schools and sports organizations. The scoreboards feature various options for customization: the numbers on the displays can be colored from a palette of 25 colors and appear as either digital segments or analog bulbs.

Both applications can be controlled in any of three methods: through a simple control panel window, keyboard shortcuts, and menu commands. They feature full undo and redo support to correct accidental changes to the score.

VirtuaScore Volleyball and VirtuaScore Tennis require Mac OS X 10.6.6 or higher. They’re available at the Mac App Store. They’re regularly priced at US$14.99, but are being offered for $4.99 for a limited time.