Mendeley Desktop is a reference manager that allows you manage, read, share, annotate and cite your research papers.
You can download Mendeley Desktop here.
You can also manage your references in the Mendeley Web Library, which allows you to access the items in your Mendeley library from any web browser. You can achieve many of the core Mendeley features (such as uploading new references, reading papers, highlighting and annotating) from any device with internet access, without the need to install any software.