If you want to write movie screenplay, you need to spend lot of times to read other movie screenplays. Because you need to learn screenplay writing and format screenplay. Here is a list of websites to download movie scripts and screenplays (also free).
Large movie script database collection to find latest Hollywood movies screenplay based on genre ( Action, comedy, adventure, Drama, mystery, thriller, romance family and horror). But you can only download html files to read screenplays.
This is the best site to find Movie scripts, Non English scripts, TV scripts, Radio scripts, Musical scripts, Play scripts and Unproduced scripts. It also provide information about upcoming screenwriting competition, screenplay format guide.
ScreenplayDB – There are 419 screenplays now available to download pdf format. It also provide way to submit your own screenplay.
script-o-rama – Script-o-rama provide detailed table to find different format (pdf, html, txt) and various version (draft information) of screenplays.
The Weekly Script – It provide alphabetically ordered .txt format screenplays include film, author information and description. You can also find television, radio screenplay here.