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Description

This is a hub for collaborating on the open-source version of the Java platform, standard edition, along with its associated projects. You can download and install the latest open-source JDK, including Oracle’s free OpenJDK JDK 21 binaries, which are licensed under GPL and are production-ready for Linux, macOS, and Windows. Additionally, Oracle offers commercially-licensed JDK 21 binaries that share the same underlying codebase. Users can explore the code online, clone repositories for local modifications, and contribute patches aimed at bug fixes, enhancements to existing components, or the introduction of new features. OpenJDK supplies source code that developers utilize to compile their binaries, meaning users must take on the responsibility of building the code and creating a Java runtime customized for their platforms. Given that the JDK represents a sophisticated software project, constructing it requires a certain level of technical skill, several dependencies on other software, and a computer with adequate processing power. Engaging with OpenJDK not only fosters community collaboration but also enables developers to hone their skills through hands-on experience with a pivotal technology.

Description

QCAD is a free and open-source software tool designed for two-dimensional computer-aided drafting (CAD). It allows users to produce a variety of technical drawings, including designs for buildings, interiors, mechanical components, as well as various schematics and diagrams. QCAD is compatible with Windows, macOS, and Linux operating systems. The software's source code is distributed under the GPL version 3 (GPLv3), a widely recognized Open Source license. Created with a focus on modularity, extensibility, and portability, QCAD is particularly noted for its user-friendly interface. This makes it an accessible yet robust 2D CAD solution for anyone, regardless of prior CAD experience. Users can quickly engage with QCAD to construct and modify elements such as points, lines, arcs, circles, ellipses, splines, polylines, text, dimensions, hatches, fills, and raster images. The application includes a highly capable ECMAScript (JavaScript) scripting interface, allowing for advanced functionality, along with various effective entity selection tools that enhance the drafting process. Overall, QCAD stands out as an excellent choice for both novices and experienced users looking to create detailed 2D designs.