Rocket Money might be a bit more popular than GitBook. We know about 2 links to it since March 2021 and only 2 links to GitBook. 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
I know that asktrim.com truebill.com and donotpay.com do this. There are probably others. Source: about 2 years ago
Truebill.com does a good job of ID'ing subscriptions. Source: over 2 years ago
Docusaurus - Easy to maintain open source documentation websites
Bobby - Keep track of your subscriptions
MkDocs - Project documentation with Markdown.
Mint - Free personal finance software to assist you to manage your money, financial planning, and budget planning tools. Achieve your financial goals with Mint.
Doxygen - Generate documentation from source code
Trim - Manage and cancel your paid subscriptions