Arlo is a secure tool for conducting Risk-Limiting Audits (RLAs) used by 11 states. It was developed by VotingWorks with support from the U.S. Department of Homeland Security.
The code for Arlo is open-source and freely available for anyone to use. VotingWorks optionally provides hosting and support to states and local jurisdictions.
In addition to software, VotingWorks provides planning, training, and support for jurisdictions conducting risk-limiting audits.