A polarized beam dynamics software tool is developed at BNL, which is routinely used for on-going polarization studies regarding the EIC, at both BNL and Jefferson Lab. These developments are being supported and tightly benchmarked over the years in the general R/D context of RHIC collider spin physics program. They further lean on tight collaborations with others, in the frame FOA and SBIR DOE programs, and NY State programs. As part of the EIC R/D dynamics, these activities aim at responding to the DOE recommendations in the matter of software tools: "EIC will be one of the most complex collider accelerators ever to be built. [...] Technical Challenges for EIC [include] Beam and spin dynamics and benchmarking of simulation tools [...]. State of the Art Accelerator Technology for EIC [must address] Simulation Codes: Benchmarking of realist EIC simulation tools against available data needs to be aggressively pursued.". The present contribution to eicug2019 is based on recent detailed publications in journals, conferences, workshops, and as lab notes, regarding : RHIC and injectors; eRHIC and JLEIC; rapid-cycling synchrotron methods; BNL-Cornell's CBETA and ERLs.
 Manouchehr Farkhondeh, "DOE Support to EIC Accelerator R&D and FOA Landscape", slides 9, 10; EIC Accelerator Collaboration Meeting 2018, Thomas Jefferson Lab, Oct. 29, 2018. https://www.jlab.org/indico/event/281/session/5/contribution/15