Unity (AKA: Unity3D/Unity2D, U3D for short) is currently the most popular multi-platform free game engine developed by Unity Technologies from Denmark (mainly written in C, C++ and C#, and first released in 2005). Users with C# and JavaScript programming experience can get started more quickly.

DecSoft HTML Compiler is a popular HTML-to-EXE converter with compact file size and powerful features, developed by David Esperalta from Spain. It allows you to package a complete HTML application (along with all included files like HTML, CSS, JavaScript, image, etc.) into an independent and executable Windows application. This executable HTML app can be e-Book, presentation, even a game, and more.

PEiD (short for PE iDentifier) is a well-known professional packer/cryptor/compiler detecting tool. It's so powerful that it can detect the types/signatures of almost any PE file packing tools (at present, the number has been more than 600 kinds). In addition to the official version, AppNee also provides you its full-plugin version, which can be treated as the most perfect one version (contains 60+ plugins and necessary runtime library files: mfc70.dll, msvcr70.dll, rtl70.bpl, vcl70.bpl) on the Internet at present. I do believe reverse engineers or software cracking/unpacking enthusiasts must like it very much.

Database Workbench is a powerful and comprehensive database application developed by Upscene Productions for database developers and administrators. It offers a single development environment for developing/managing multiple types of relational database engines using SQL.

Keil C51 is an easy-to-learn and easy-to-use C language Single Chip Microcomputer (SCM) programming software (IDE) for all 8051 Microcontroller devices. It is suitable for each level of developers, whether he is a professional application engineer, or a student who just started to study the embedded software development.