Open-source tools
Open-source vs hosted: what "free" really means
Open-source tools are free to use, but "free" usually means self-hosted — you run it on your own server and absorb hosting, maintenance and updates. Many also offer a paid managed/cloud plan that competes directly with the proprietary SaaS it replaces. We list both: the self-host option and the hosted price where one exists, so you can weigh the real total cost. Each tool links to its full profile with alternatives and price history. 自建（self-host）虽免费，但需自行承担服务器与维护成本，下方价格为其托管版定价（如有）。