Synopsys VCS - HDL Simulator of System Verilog, Verilog, and VHDL for ASIC design and verification.

Calamari - Calamari helps organizations, companies, and enterprises to manage their human resources in an easy and compliant way by delivering modern and easy-to-use time tracking and attendance management tools.

ModelSim - ModelSim-Altera Software

Sage HR - Sage HR is a one-stop shop for your HR management needs. Your HR - simplified!

Cadence Incisive - System Verilog, Verilog, VHDL, SystemC HDL Simulator for ASIC Design and Verification

TimeOffManager - TimeOffManager.com provides a fully automated online system for tracking and managing employee absence, leave, paid time-off and attendance.