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Extensions 
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Copy As Plain Text
Easily copy the selected text without formatting to the clipboard via the right-click menu.
Copy as Plain Text
Extension to copy selected text as plain text. Also option to Append as plain text. Keeps carriage returns and line feeds.
Copy Plain Text
Allows to copy plain text to clipboard with context menu. Has 3 different copy methods. Has 'force plain text copy' option.
Page Plain Text
Chrome extension that shows page plain text and allows you to edit or download the text
G RTF: Plain to Rich Text
GRTF is Rich Text Format for Google Forms, Twitter, and other non-RTF text boxes... This version is dedicated to #LJTECHi3.
Copy URL with Title (plain text/markdown)
Copy the title and URL in plain text/markdown format by 'key'board shortcuts: Ctrl+C/Cmd+C for plain text, Alt+C/Opt+C for markdown.