Based on our record, GitBook seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You can have both a landing page (e.g.: www.your-project.dev) and a documentation website (e.g.: docs.your-project.dev). For creating documentation website GitBook is better fit than Gitlanding. GitBook is free for open source Projects (you just need to issue a request). - Source: dev.to / about 2 years ago
GitBook is a collaborative documentation tool that allows anyone to document anything—such as products and APIs—and share knowledge through a user-friendly online platform. According to GitBook, “GitBook is a flexible platform for all kinds of content and collaboration.” It provides a single unified workspace for different users to create, manage and share content without using multiple tools. For example:. - Source: dev.to / about 3 years ago
Docusaurus - Easy to maintain open source documentation websites
userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.
MkDocs - Project documentation with Markdown.
UX Timeline - See how some of today's best companies have evolved
Doxygen - Generate documentation from source code
UXReality - UXReality: One App Instead of Lab