I’ve been using Proteus for microcontroller simulation for years, and the 8.9 SP2 Professional bundle with Arduino 1.8 is arguably one of the most practical releases for students, hobbyists, and even rapid prototyping engineers.
Disclaimer: Always support software developers by purchasing official licenses for commercial use. This guide is for educational understanding of the software ecosystem. Proteus 8.9 Sp2 Professional With Arduino 1.8 UPD Free