Calyx
Intermediate language and infrastructure for Hardware Accelerator Generators
Circt
Circuit IR Compilers and Tools
EPFL Logic Synthesis Libraries
A collection of modular open source C++ libraries for the development of logic synthesis applications
HWToolkit (hwt)
VHDL/Verilog/SystemC code generator and simulator API written in Python/C++
Kactus2
A graphical EDA tool based on the IP-XACT standard
LiveHD
A productive infrastructure for Synthesis and Simulation
Low Level Hardware Description (LLHD)
A foundation for building hardware design tools
SpyDrNet
A flexible framework for analyzing and transforming FPGA netlists
Torc
Tools for Open Reconfigurable Computing