There are many alternatives to XMind as a web app if you are looking for a replacement. The best Online alternative is Mindomo, which is free. If that doesn't suit you, our users have ranked more than 100 alternatives to XMind and many of them are available as a web app so hopefully you can find a suitable replacement. Other interesting Online alternatives to XMind are Lucidchart (Freemium), MindMeister (Freemium), TheBrain (Freemium) and Penpot (Free, Open Source).
Minzel is a beautiful and free mindmapping tool built for creatives and gives you the power to visualize your thoughts. It is simple to use and allows fast and productive mind mapping. You can use Minzel on every modern browser.
GitMind is a free online mind map maker for brainstorming, project planning, development, action, and other creative tasks. This tool lets you share mind maps with tons of users and collaborate with them.