gitignore.io - Online .gitignore Generator
Generate .gitignore file from hundreds of templates for various Operating Systems, IDEs, and Programming Languages.
StackEdit.io - an Online Markdown Editor
A free, open-source, online WYSIWYG Markdown editor based on Pagedown. Just open the website and start editing, and optionally sync your documents with Google Drive and Dropbox, or publish them on GitHub, Blogger, WordPress, etc.