From the the Public Library of Science (PLOS) Blog:
In 2009, PLOS became the first (and remains the only) publisher to launch an open source Article-Level Metrics (ALM) app to help other publishers implement ALM on their journals. Now we are pleased to announce that two leading organizations are implementing ALMs using the PLOS open source app.
The Public Knowledge Project (PKP, provides software used by thousands of journals and hosting services to publishers like Co-Action Publishing) and Copernicus Publications (an innovative Open Access publisher) are both launching ALM programs based on the PLOS app.
From the Public Knowledge Project:
The purpose of ALMs is to provide a more accurate means for measuring the impact of research at the article level rather than the journal level, as is tradition, said Juan Pablo Alperin of PKP. “ALMs have the potential to be a truly valuable tool for both publishers and readers. We urge all journals using our Open Journal Systems (OJS) to sign-up for the service.” PKP’s ALM offering is built on an open source application developed by the Public Library of Science (PLOS) and has been implemented with the guidance and support from PLOS.
Co-Action Publishing, a close partner of PKP and one of its first hosted clients in 2007, is the first publisher to implement the service. “Co-Action’s wishes, requirements and feedback have been instrumental in the development and evolution of our publishing platform, and most recently our implementation of ALMs,” Alperin said.