Modern EDA tools like KiCad (free and open-source) or EasyEDA (cloud-based) have caught up significantly. KiCad 7+, for example, offers better schematic capture and PCB routing than Proteus 7. However, KiCad does have real-time microcontroller simulation. That remains Proteus's unique selling point.
Proteus 7.7 SP2 is an older but highly functional version of the Proteus Design Suite by Labcenter Electronics , primarily used for electronic design automation (EDA). It is a comprehensive tool that allows engineers and students to design schematics, simulate complex circuits, and create professional printed circuit board (PCB) layouts within a single environment . Proteus 7.7 SP2 Portable