NotePlan - Make plans inside an individual markdown note for every day in your calendar. Use it as a journal for your daily tasks and plan todos in advance. For Mac, iPhone and iPad.
Insight.io - Best web-based IDE-like source code browsing and search tool
Markdown to PDF - Super simple way to get your markdown files to PDF
Krugle - Krugle is the complete enterprise solution for search targeted to the development organization.
UnMarkDocs - Unleash the Power of Markdown to Write Better Product Documentation
Sourcegraph - Sourcegraph is a free, self-hosted code search and intelligence server that helps developers find, review, understand, and debug code. Use it with any Git code host for teams from 1 to 10,000+.