Download of Zocalo Exp 2011.1 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The software relates to Business Tools. The actual developer of the free program is Chris Hibbert. The most popular version among Zocalo Exp users is 2011.1.
From the developer:
Zocalo is a toolkit for building prediction markets, markets in securities that pay out depending on outcomes of future events. They provide estimates of the likelihood of specific outcomes that are more reliable than other sources of predictions. The Zocalo Project Lead is Chris Hibbert.
You may want to check out more software, such as EXP Viewer, EXP or Expat Shield, which might be similar to Zocalo Exp.