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Iceberg Editor - A beautiful markdown editor for WordPress.
Jekyll-Markdown - An elegant markdown blog generator using Jekyll
Upsite - A multi-tenant minimal website builder made with Ruby on Rails
LightPaper - Admired by thousands, LightPaper is a powerful markdown editor with features such as Multi-Tabs, Folder Navigator, Distraction Free Mode, Quick Open, Live Preview, Full GFM Support, Math rendering etc.
Driwwwle - Driwwwle is an open-source social platform for developers to showcase their projects and meet creative developers across the globe.