Altium Designer might be a bit more popular than simavr. We know about 1 link to it since March 2021 and only 1 link to simavr. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Now that they ALSO have an equivalent to PIO it might even help with reaching faster IO speed when toggling pins. [0]: https://github.com/buserror/simavr. - Source: Hacker News / 15 days ago
Check out Altium’s website (altium.com. A lot of free resources that might help. They also have a YouTube channel. Good luck. Source: about 1 year ago
Emulino - an emulator for the Arduino platform by Greg Hewgill
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
SimulAVR - The SimulAVR program is a simulator for the Atmel AVR family of microcontrollers.
Autodesk EAGLE - Autodesk EAGLE is an electronic design automation (EDA) software.
Xyce - Xyce is an open source, SPICE-compatible, high-performance analog circuit simulator, capable of solving extremely large circuit problems by supporting large-scale parallel computing platforms.
EasyEDA - EasyEDA - Web-based EDA suite; runs in browser.