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Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
LinkAce - A selfhosted bookmark manager with advanced features.
Wondershare PDFelement - All-in-one PDF editor
Bookmark Sidebar - Adds a toggleable sidebar with all your bookmarks at the edge of your browser window.