The Open Voting Consortium (OVC) began from "a proposal to develop a pilot project in one county in California" and has spawned the voter verifiable, open-source
Electronic Voting Machine project:

"The Open Voting system preserves the paper ballot. However, under the Open Voting system the voter marks the ballot using a computerized voting station rather than a pencil or colored marker. The ballot is printed in plain text that the voter can read. Voters have the opportunity to inspect the ballot to ensure that it properly reflects their choices."

"The Open Voting system preserves the ballot box. Voters must insert their paper paper ballots into the ballot box. The Open Voting system ballots contain a bar code in addition to the plain text. This bar code makes it easy for the voting place workers to count the ballots when the ballot box is opened."