Scrite is a free and open-source app for Windows and Mac Desktops (soon on Linux also) using which you can create screenplays. This video is a demo of the Scrite app. The voice over in this video is in English, we will have another video in Kannada as well. PS: Kindly pardon all the bloopers in the video
This video was made when the first Scrite Beta was released in April 2020. While the concepts covered in the video are still valid, much has changed with the UI of the app since then.
If you prefer reading to watching a video, then you can read a detailed user guide here.