Quadstone Paramics is described as 'leading microscopic traffic and pedestrian simulation software used by planning professionals to design efficient, economical, driver and pedestrian friendly transportation infrastructure'. There are more than 10 alternatives to Quadstone Paramics for Windows, Linux, Mac and Docker. The best alternative is MATSim, which is both free and Open Source. Other great apps like Quadstone Paramics are Simulation of Urban MObility (SUMO) (Free, Open Source), TransCAD (Paid), TSIS-CORSIM (Paid) and Aimsun Next (Paid).
"Simulation of Urban MObility" (SUMO) is an open source, highly portable, microscopic and continuous road traffic simulation package designed to handle large road networks. SUMO is licensed under the Eclipse Public License V2.
TSIS is an integrated development environment that enables users to conduct traffic operations analysis. Built using a component architecture, TSIS is a toolbox that contains tools that allow the user to define and manage traffic analysis projects.
This release of the Highway Capacity Software (HCS7) includes updated modules to implement the Highway Capacity Manual 6th Edition (HCM6) procedures for Signalized Intersections, Urban Streets, Alternative Intersections, Roundabouts, Freeway Facilities, Basic Freeway Segments...