Conscious Style Guide: To grow as a writer, it is important to be aware of how language evolves as society changes. This tool gets you thinking about inclusive and empowering choice of words in your writing.  
Log on to consciousstyleguide.com 

Grammar guru

Poll

Who will win the Punjab Elections?

BJP 32.79%

AAP 42.62%

INC 24.59%

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Hemingway Editor: I often recommend Hemingway Editor for improving style and readability of write-ups. The website version is completely free to use. 
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Kshitija Agrawal, editor, Full Circus

LanguageTool: It offers grammar checks in multiple languages besides English, and has cool features like checking numbers, names, and gender. 
Log on to languagetool.org

Other tools

ProWritingAid: It is a powerful tool, for fiction writers. It checks grammar and offers insightful tips for improving sentence structure. 
Log on to prowritingaid.com

Tara Khandelwal and Shreya Punj

The Purdue OWL: I often refer to Purdue Owl’s grammar techniques, especially the use of the comma. I find that one has to keep refreshing one’s memory and keep practising. 
Log on to owl.purdue.edu

Inputs from Shreya Punj, commissioning editor, Penguin India and admin, The Editor Recommends on Instagram, and Tara Khandelwal, founder at Bound