Ambra is described as 'innovative Open Source platform for publishing Open Access research articles. Ambra high-volume, efficient and economical system for the publication of research articles in all areas of science' and is an app in the Education & Reference category. There are seven alternatives to Ambra for Linux, Windows, Mac, Online / Web-based and Self-Hosted solutions. The best alternative is Evergreen ILS, which is both free and Open Source. Other great apps like Ambra are Invenio (Free, Open Source), DSpace (Free, Open Source), Greenstone Digital Library (Free, Open Source) and Open Journal Systems (Free, Open Source).
Evergreen is a highly-scalable software for libraries that helps library patrons find library materials, and helps libraries manage, catalog, and circulate those materials, no matter how large or complex the libraries.
Greenstone is a suite of software tools for building and distributing digital library collections on the Internet or CD-ROM. It is open-source, multilingual software, issued under the terms of the GNU General Public License.
Open Journal Systems (OJS) is an open-source software for the management of peer-reviewed academic journals, and is created by the Public Knowledge Project, released under the GNU General Public License.
Fedora (Flexible Extensible Digital Object Repository Architecture) was originally developed by researchers at Cornell University as an architecture for storing, managing, and accessing digital content in the form of digital objects inspired by the Kahn and Wilensky Framework.