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General principles
RePEc (Research Papers in Economics) is a collaborative effort of hundreds of volunteers in 102 countries to enhance the dissemination of research in Economics and related sciences. The heart of the project is a decentralized bibliographic database of working papers, journal articles, books, books chapters and software components, all maintained by volunteers. The collected data are then used in various services that serve the collected metadata to users or enhance it.
So far, over 2,000 archives from 102 countries have contributed about 3.5 million research items from 3,600 journals and 5,300 working paper series. Over 62,000 authors have registered and 80,000 email subscriptions are served every week. See below on how you can be part of this initiative.
RePEc services
The following are services that use (principle) and contribute RePEc data. They also report usage statistics that can be used towards the RePEc rankings.

Munich Personal RePEc ArchiveAuthors in institutions lacking a participating RePEc archive can submit their papers to MPRA and get them included in the RePEc database.

RePEc Author ServiceAuthor registration and maintenance of a profile on RePEc.
IDEASThe complete RePEc database at your disposal. Browse or search it all.
EconPapersEconomics at your fingertips. EconPapers provides access to all of RePEc. Browsing and searching available.

EDIRCDirectory of Economics institutions, with links to their members and publications listed on RePEc
NEPNew Economics Papers is a free email, RSS and Twitter notification service for new downloadable working papers from over 90 specific fields. Archives are also available.
RePEc GenealogyAcademic family tree for economics.
LogEcDetailed download and access statistics for RePEc items and authors.
CitEcCitation analysis from items in the RePEc database.
CollEcRankings by co-authorship centrality for authors registered in the RePEc Author Service.
RePEc BiblioHand-selected bibliography of articles and papers in economics.
RePEc Plagiarism CommitteeAn effort to curtail plagiarism of RePEc contents.
EconAcademics.orgBlog aggregator for discussion about economics research.
SocioRePEc.orgService to annotate RePEc papers in PDF and establish scientific relationships between papers.
SPZAn online workplace for researchers, tutors and students within the RePEc information space.
SocionetA Russian (and Russian language) implementation of the RePEc method and database as the collective information environment for the social sciences. Database customization and filtration by a "personal information robot".
Additional websites using RePEc
The RePEc bibliographic data is in the public domain and thus used by other services as well. The following are the ones we know of, and unfortunately none report usage statistics back to LogEc.
Adding bibliographic information to RePEc
The basic principle is that publishers index their content themselves into RePEc. They host the metadata on their http or ftp site, following the Guildford Protocol, which indicates how the metadata archive should be structured. Then, the syntax of the metadata template syntax is guided by ReDIF, the Research Documents Information Format.
If you intend to contribute information about your publications to RePEc, you may read the above documents or use these step-by-step instructions or sample templates​. The same instructions apply for commercial publishers or research institutes.
RePEc archive maintainers may also make good use of the template syntax and link checker, of tips and tricks and the FAQ.
Mailing lists for RePEc:
RePEc is entirely based on the contributions of volunteers: Maintainers of RePEc archives, editors at NEP and MPRA, and those who run the various RePEc services. If you want to get involved check out our volunteer opportunities or contact any member of the RePEc team.
The ArchEc project provides long-term archiving of RePEc templates and full-text files, with the support of the Fondation Banque de France.
RePEc emerged from the NetEc group, created in 1992, which received support for its WoPEc project between 1996-1999 by the Joint Information Systems Committee (JISC) of the UK Higher Education Funding Councils, as part of its Electronic Libraries Programme (eLib). RePEc was created in June 1997 to decentralize the work done by WoPEc and thus make it independent of grant needs. RePEc is then guaranteed to remain free for all parties.
Each RePEc service has contact details; for any question, please email them. For general enquiries about RePEc, in particular to open a RePEc archive, contact Kit Baum or Christian Zimmermann​.