Design

Following my list:
Web application
Web applications are some of the most popular tools around, making them a great website idea for developers.
Trello, for example, is a popular no-code web app for project management that helps teams organize tasks, collaborate, and stay productive using custom to-do lists. It provides a visual platform where users can create boards, lists, and cards to manage their projects and workflows.
Plus, the software offers responsive design, meaning it works on mobile devices like iPhones or Androids