The bigger of the two open source screenwriting software programs is Celtx. Celtx comes with a lot of the features that paid software programs, including Final Draft, charge for. Besides the standard screenwriting features, the software also comes with pre-production software, which will give you are more comprehensive view of how your screenplay will be shot.
Like Page 2 Stage, Celtx allows you to create reports that will set up character, scene and dialogue flow. But, it also allows you to take it one step further. You can select what options that you would like to deal with it. For example, if you want to focus solely on the dialogue for a character, you can select the Dialog box, and you will be able to see the dialogue individual scenes. Celtx also allows you to add additional elements to your scenes, including props or special effects. This is down via the Breakdown Menu.
While Celtx does have a lot of features of the major screenwriting software programs, it also has a number of glitches. Celtx can run slow if you have a lot of windows or programs open. Other glitches include the program by itself adding tags to elements, the cursor not going where you want it to go or the underline feature not working. Another issue is that there are a number of Celtx folders, which means it sometimes difficult to find your project.
But, overall the program works quite well, and it eliminates the need to spend nearly $200 on screenwriting software programs.