Pagemark is described as 'Private bookmark organizer with tags, thumbnails, and formatted notes' and is an website in the Web Browsers category. There are more than 25 alternatives to Pagemark, not only websites but also apps for a variety of platforms, including Google Chrome, Firefox, Windows and Android. The best alternative is Raindrop.io, which is both free and Open Source. Other great sites and apps similar to Pagemark are Diigo (Freemium), start.me (Freemium), Stash.ai (Paid) and Bookmark Sidebar (Free, Open Source).
Bookmark Sidebar is an extension for Chrome, which adds a toggleable sidebar with all your bookmarks on the left or right side of your screen. You can sort, edit, delete or rearrange your bookmarks easily from within the sidebar.
LinkAce is meant to provide a long-term archive of links to websites, media files or anything else which has a valid URL. Store interesting articles, neat web tools or libraries you may use sometime in the future.
"Highlights - Highlighter and Web Clipper" chrome extension by Learning Paths, helps you organise your content across the internet. Highlight, Tag and add notes to relevant content across the internet.