WriterDuet
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Browser-based screenwriting software, with desktop and mobile apps, that applies standard screenplay formatting automatically and supports real-time co-writing. Users can draft, co-edit and export correctly formatted scripts to PDF and Final Draft files, with a free plan offering limited features.
More resources on Script Formatting
The Screenwriter’s Bible
David Trottier's screenwriting reference combining a primer on story structure, a workbook on the writing process, detailed formatting rules for screenplays and TV scripts, and a guide to selling a spec script. Readers can format a spec screenplay to industry convention.
scriptmag.com
Script Magazine is an online publication for screenwriters featuring craft-focused articles, interviews with industry professionals, and practical resources like sample scripts and market news to help you write, develop, and pitch your projects.
The Hollywood Standard
Reference guide to screenplay and teleplay format by the former head of script processing at Warner Bros. Rule-by-rule examples for scene headings, action, dialogue, transitions, and camera directions show writers how to produce spec and production scripts that meet studio conventions.
finaldraft.com
Final Draft is the industry-standard screenwriting software and resource hub. The site provides script formatting tools, templates, tutorials, and other resources to help writers format and develop film, TV, and stage scripts.