nullDC is a free, open source 32-bit Sega Dreamcast and Sega NAOMI (arcade edition of Sega hardware) game consoles emulator for Windows, first released in 2006 and discontinued in 2011. While, even compared with its successor - Reicast, nullDC is still a better choice for Dreamcast emulation on Windows.

PPSSPP (short for PlayStation Portable Simulator Suitable for Playing Portably) is a cross-platform and open-source emulator originally created by Henrik Rydgård (AKA: hrydgard, one of the main members in the development team of the renowned NGC/Wii emulator - Dolphin) from Sweden, in 2012. It can perfectly run the vast majority of PSP games, supports Windows, Linux, Mac OX, Android, iOS and many other mainstream computer and mobile device operating system.

Crossword Sage is a free, open source and cross-platform (based on JRE) crosswords intuitive maker, designed to help you build and publish your own professional and good looking crossword game.

Brackets (successor of Edge Code, and should be called Adobe Brackets) is a cool, lightweight, powerful, free and open-source/cross-platform web front end developing IDE for Windows, Mac OS X and Linux. It's created and maintained by Adobe Systems, written in HTML, CSS, and JavaScript and focuses on modern web design/development.

DeSmuME (formerly known as YopYop DS) is the first Nintendo DS emulator that can run both homebrew and commercial game ROM at a playable level for Windows, Linux and Mac OS X. It was written in C++ and released as open source freeware.