Covidence is an online systematic review management tool that allows for independent title/abstract screening, full text screening, data extraction and risk of bias assessment. Although it is designed for use with systematic reviews, its utility translates fairly well to some other evidence synthesis methods, like scoping reviews. Cornell University Library has an unlimited license to Covidence software for members of the Cornell community located on the main campus in Ithaca, NY.
Rayyan: Free article screening tool
Zotero: Free citation management tool
RawGraphs: Free tool for creating appealing graphs
Open Science Framework Preregistration: Free, open source resource for preregistering evidence synthesis protocols, with well-documented guidance on using the tool
SnowGlobe: Free tool for "snowballing" included resources (locating their citations, and those papers that have cited them)