Yes, Qt is available under both open-source and commercial licenses. The open-source version, Qt for Application Development, is available for free under the GNU Lesser General Public License (LGPL) version 3. This allows developers to use Qt for creating open-source and commercial software. However, if you require additional support, features, or want to develop proprietary software, you can purchase a commercial license from The Qt Company. **

Qt Creator is an integrated development environment (IDE) that provides a full suite of tools for developing Qt applications, including a code editor, debugger, and visual designer. Qt Designer, on the other hand, is a standalone tool specifically for designing user interfaces using Qt's drag-and-drop interface. While Qt Creator includes Qt Designer as one of its tools, Qt Designer can also be used independently to create UI files that can be integrated into Qt Creator or other development environments. In summary, Qt Creator is a comprehensive IDE for developing Qt applications, while Qt Designer is a specialized tool for designing user interfaces. **

One CPU cooler that costs up to 50 euros is the Cooler Master Hyper 212 EVO. This cooler is known for its excellent cooling performance and is compatible with a wide range of CPU sockets. It also features a relatively easy installation process and a quiet fan. Overall, the Cooler Master Hyper 212 EVO is a popular choice for budget-conscious users looking for an effective CPU cooler. **

One popular option for a CPU cooler under 50 euros is the Cooler Master Hyper 212 EVO. It offers excellent cooling performance for its price range and is compatible with a wide range of CPU sockets. The Hyper 212 EVO features a tower heatsink design with four direct contact heat pipes and a 120mm fan for efficient heat dissipation. Overall, it is a reliable and cost-effective choice for keeping your CPU temperatures in check. **

One good cooler that falls within the 50-100 euro price range is the Coleman 50-Quart Xtreme Wheeled Cooler. This cooler is known for its large capacity, durable construction, and excellent ice retention, making it a popular choice for outdoor activities and camping trips. It also features heavy-duty wheels and a telescoping handle for easy transportation. Overall, the Coleman 50-Quart Xtreme Wheeled Cooler offers great value for its price range. **

For the Ryzen 3700X processor, a cooler that is suitable for keeping temperatures up to 50 degrees Celsius would be the Noctua NH-D15. This cooler has excellent cooling performance and is known for its ability to handle high thermal loads effectively. Its dual tower design and large fans make it a great choice for keeping temperatures low even under heavy workloads. Additionally, the NH-D15 is known for its quiet operation, making it a popular choice for those looking to maintain low temperatures without excessive noise. **

A passive CPU cooler for smartphones is a cooling solution that does not require any active components such as fans or pumps to dissipate heat from the smartphone's CPU. Instead, it relies on passive methods such as heat pipes, thermal pads, and heatsinks to transfer and dissipate heat away from the CPU. This type of cooler is designed to be compact and efficient, allowing for effective heat dissipation without adding bulk or noise to the smartphone. Passive CPU coolers are often used in high-performance smartphones to maintain optimal operating temperatures and prevent thermal throttling. **

An air cooler from TAS Electronics is a device that helps to cool the air in a room or space. It works by drawing in warm air, passing it through a cooling mechanism, and then releasing cooler air back into the room. These air coolers are energy-efficient and environmentally friendly alternatives to traditional air conditioning units. They are portable, easy to use, and can be a cost-effective way to stay cool during hot weather. **