Citrix Systems (NASDAQ: CTXS) seems to be gaining momentum with cloud services providers (CSPs). Citrix, which offers virtualization, mobile and collaboration software, delivered strong earnings results earlier this week. And more than 35 percent of CSPs indicate that they are working with Citrix, according to preliminary results from our second-annual Talkin' Cloud 50 survey, which closes today.

Citrix intends to accelerate its momentum at the upcoming Citrix Summit 2012 (May 7-8, San Francisco). The summit, designed for Citrix partners and customers, focuses on four key areas:

It's a safe bet Citrix CEO Mark Templeton will also update the world on the Citrix CloudStack strategy. Citrix is open sourcing CloudStack through work with Apache. CloudStack is considered a rival to OpenStack, another open source cloud platform. Templeton, meanwhile, has spent more than a decade gradually pushing Citrix beyond its multi-user software heritage.

The strategy seems to be working. Citrix this week said its Q1 2012 revenues rose 20 percent to $589 million, and Citrix shares are trading near a 52-week high. In a prepared statement, Templeton said demand for mobility, enterprise cloud evolutions and hosted cloud services is driving Citrix's growth.

Citrix is part of our Talkin' Cloud Stocks Index, which is updated each Friday after U.S. markets close for the weekend.