First released in 2004, Foxit Reader's downloads have been growing about 10% each month this year, to almost 4 million a month, says Erik Bryant, director of sales for Foxit Software.

"We're not only getting more downloads, but also more inquiries from large corporations who want to replace Adobe Reader for as many as hundreds of thousands of employees," Bryant told on Thursday.

For one, Foxit is talking to an unnamed American bank about replacing Adobe Reader for all 300,000 of its workers, as well all related Adobe tools, such as Adobe Acrobat, Bryant said.

Tools such as Acrobat are key. While Foxit offers enterprise-supported versions of the Foxit Reader at a low per-seat price, it makes most of its money from tools such as its PDF software development kit, which is sold to software developers, and enterprise tools such as the PDF Creator, which can replace the more expensive Adobe Acrobat.

Sales at Foxit are on track to double over last year, said Bryant, who would only say the 150-employee company's annual revenues are in the range of between $5 million and 20 million.