BibSonomy is a social bookmarking service and can be used to export bibliographies in a variety of formats and feeds.

RefME is a web-based tool for generating citations, reference lists and bibliographies; there is an option for importing .ris files. It is also

available as an App.
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RefWorks Simplifies the process of research, collaboration, data organization, and writing by providing an easy-to-use tool for citation, bibliography, and reference management.

EndNote Basic is entirely web-based and allows you to store, manage and share your references, cite sources and write your papers. It is a simpler, free version of the commercial tool Endnote Desktop. (Please disregard the 'Sign in via your institutional login' option on the 'Sign In or create an account' page.)

Mendeley is a reference manager and academic social network that is fully searchable with capacity for reading and annotating PDFs on any device. It is available as web-based or as a standalone desktop version.

Zotero is a free bibliographic software extension for Firefox. It is also available as an extension for Chrome and Safari browsers, and as a standalone desktop version. ​​