Qiqqa
8.0#2 in citation management softwareFrom $6.67 a monthFree planAndroidWebSelf-hostedWindows
VisitQiqqa suits researchers and other readers who manage PDF collections, annotate papers, and build bibliographies. Its library sharing and role controls may also suit groups collaborating on research materials.
rcites suits R users who need Species+ taxon, legislation, distribution, or listing-reference data through the API. It requires a personal authentication token and R version 3.1.0 or later.