Just fucking pick one:
- Final Draft – the standard since the 90s
(also Final Draft files are the standard file format for collaboration in the industry, but most of these programs export smoothly to .fdr)
- Fade In – also popular
- Highland 2 – good shit, free to try, Apple only
- WriterDuet – best tool for online collaboration, flexible pricing
- Scrivener – popular with people who also write books
- KIT Scenarist – freemium open-source software with paid-tier services
If you join UCLA’s WP Now program, you can get discounts on certain screenwriting software.
Don’t be asking everyone what to use, it’s a personal preference. Seriously, just fucking pick one.