Citra (AKA: eMu3Ds) is currently the only still living 3DS emulator for Windows, Linux, Mac and Android platforms. It is written in C++ and open source, and can run partial 3DS classic games better. Although supporting all HD 3DS games has a long distance, yet from the official news we are sure this is not far off.

NO$GBA (short for Nocash Game Boy Advance, AKA: No Cash GBA) is an NDS (Nintendo Dual Screen)/NDS Lite/GBA (GameBoy Advance) all-in-one emulator for both MS-DOS and Windows platforms which are perfectly compatible with most NDS games.

Project64 (PJ64 for short) is a free and open-source Nintendo 64 (N64) game console emulator for Windows platform. It has very high game compatibility and dispenses with the BIOS files, allows users to play the classic N64 games on the computer with ease.

VisualBoyAdvance (VBA for short) is the number one, the most successful and most popular handheld emulator in the history of Game Boy Advance emulation. It is also one of the best video game emulators, and it's completely free and open source.

ZSNES is an open source Super Nintendo Entertainment System (SNES) /Super Famicom (SFC) video game emulator for PC users, it has very high compatibility and supports Windows, Linux, FreeBSD, and MS-DOS.