Digital Logic Design is a Software tool for designing and simulating digital circuits. A circuit is composed of gates, flip-flops, standard combinational and sequential components and Modules. A number of gates, flip-flops and standard combinational and sequential components are provided in the software. A component can also be customized as per user requirements. Various control pins can also be added and removed from the component. A circuit can easily be converted into a reusable Module. A Module acts like an Integrated Circuit or IC. More complex circuits, like CPU, are built by designing and incorporating different Modules in a modular fashion. The simulation provides the ability to monitor the working of a circuit. The circuit working can be analysed and monitored at various points by using CRT and digital Oscilloscope provided in the software. In this software, a circuit may also be constructed by providing values for Boolean Sum-of-Product. This Software may be used by professionals, hobbyists and students alike. Teachers can incorporate this software in various courses like Digital Electronics, Digital Logic and Computer Design, Computer Architecture, Computer Organization and Embedded Systems.