As a side note, Clarizen includes with each company subscription a single free license for a partner.
The company hopes to charge companies subscriptions for access to data and analysis gathered from users of the app in the future.
Socialtext is used as a collaboration tool by 5,000 companies (subscriptions are as much at $15 per employee per month).
ZeniMax first claimed at the end of April that Carmack had taken ZeniMax technology, with the Wall Street Journal reporting on legal letters passing between the companies (subscription required).
For many technology sector companies, subscription-pricing models deliver the kind of predictable, recurring revenue that the market loves.
People with knowledge of both companies' subscription rates said that Apple was growing its subscriptions at 5% per year in the U.S. versus Spotify's 2% subscription rate.
But all eyes were on the subscription video company's subscription numbers, as it tries to jumpstart lagging growth in the U.S. while also growing overseas.
According to the Times Company, digital subscriptions to The Globe and BostonGlobe.com grew to about 28,000 subscribers in the fourth quarter of 2012, an 8 percent increase from the end of September.
The company sells subscriptions for access to ringtones, games and other content for mobile phones.
