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Get. Connect to a software web site to get the software and for information on installing and using the software.
Support. Do notice that each of these sites has support for answering questions you might have.
Cost. Zotero and Mendeley are free to download and install. EndNote has a free trial version you can install for a short time, but thereafter you have to pay for the version that you install on your computer. For the free "web" version of EndNote, see Comparisons at left.