TiddlyWiki Alternatives for Online

XWiki is a powerful, open-source wiki software platforms written in Java, designed for creating collaborative knowledge bases, documentation, and collaborative workspaces. With a strong emphasis on extensibility, it supports multiple languages, real-time collaboration, and a wide range of features for content management and team productivity.

Confluence is a powerful team collaboration and knowledge management tool that helps teams create, organize, and discuss work effectively. It provides a central space for documentation, project planning, and team communication, making it easier for teams to stay connected and informed.

Nuclino is a unified workspace designed for teams to collaborate, share, and organize knowledge efficiently. It combines wikis, documents, project management, and collaboration tools into a single, intuitive platform, fostering seamless teamwork and knowledge accessibility.

BookStack is a free and open-source platform designed for creating and managing documentation and wiki content. Built with PHP and Laravel, it provides a straightforward and user-friendly interface for structuring information effectively for teams and individuals.

Wiki on a Stick is a highly portable, standalone personal wiki designed to run directly from a single self-modifying XHTML file. Ideal for managing notes, knowledge bases, and outlines on the go without requiring installation.

Notion is an all-in-one workspace that combines notes, documents, wikis, project management, and databases into a single, highly flexible platform. It empowers teams and individuals to manage knowledge, plan projects, track tasks, and collaborate seamlessly, adapting to nearly any workflow or organizational structure.