Google Docs has all the features you need to write a paper in MLA format, as well as a template to set one up automatically.

Google Docs' guide on using the MLA format, from choosing the font down to creating the "Works Cited" page.

Choose the format that your professors prefer (MLA, APA, or Chicago), and you’re done. This feature actually went live for regular Docs users a while back, but now it’s going live for G Suite ...