What are some alternatives?
When comparing Tiki Wiki CMS Groupware and HackMD, you can also consider the following products
WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.
Google Drive - Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
Drupal - Drupal - the leading open-source CMS for ambitious digital experiences that reach your audience across multiple channels. Because we all have different needs, Drupal allows you to create a unique space in a world of cookie-cutter solutions.
Google Drive - Slides - Create a new presentation and edit it with others at the same time — from your computer, phone or tablet. Free with a Google account.
Joomla - Joomla! is the mobile-ready and user-friendly way to build your website. Choose from thousands of features and designs. Joomla! is free and open source.
Etherpad - Etherpad is a highly customizable Open Source online editor providing collaborative editing in...