TronDS is described as 'A Nintendo 3DS Emulator, It's very simple and is only capable of running homebrews' and is an app in the Gaming Software category. There are four alternatives to TronDS for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and OpenPandora. The best alternative is RetroArch, which is both free and Open Source. Other great apps like TronDS are Citra (Free, Open Source), vvctre (Free, Open Source) and 3dmoo (Free, Open Source).
What is RetroArch? RetroArch is a modular multi-system emulator system that is designed to be fast, lightweight, and portable. It has features lacking in some emulators frontends, such as real-time rewinding and game-aware shading. What systems does it play?
An experimental open-source Nintendo 3DS emulator/debugger written in C++. At this time, it only emulates a very small subset of 3DS hardware, and therefore is only useful for booting/debugging very simple homebrew demos. Citra is licensed under the GPLv2. Refer to the license.