In some independent filmmakers fantasy worlds, the people (and perhaps the government) should subsidize their work and creative efforts so they can learn, grow, and afford the latest tools allowing them greater production values and the ability make enough to live comfortably while pursuing their (unfortunately appearing to outsiders as self-serving) career objectives as filmmaking artists and truth-tellers. History has shown this system has a hard time motivating people to create and produce, but perhaps someday the right people will be in charge and the redistribution of wealth will be handled fairly. Needless to say those at or near the center of a centrally controlled system do better than "according to their need", and those away from the center get to provide a bit more of the labor and resources. In a communist (central controlled market) system everyone works for the good of the people, and all "profits" from creativity and industry are to be shared by all according to their need. If they ask too little, they will fail to remain in business. If they ask too much, they will fail to sell their product. The producer calculates the time and resources that go into the development, then the ongoing production, advertising and delivery costs, and tries to make a profit selling the product. In a free market (capitalist) system, a person or group of persons create a product (or service), usually based on the perceived need in the marketplace, but often a new product is one they wished existed and assumed others would find value in if it existed.
Also, it's much cheaper than Final Draft and Movie Outline.
It's a fairly complex piece of software to use initially, but the tutorial that comes with the software is easy to follow and explains most of the features. You have the capacity to write in a non-linear manner, to juggle scenes as you see fit, corkboard mode with scene index cards, export to a wide variety of formats, add notes, a full-screen mode, and a lot more. You can even embed research and reference material directly into your Scrivener project (accepts audio, video, web, PDFs etc.). character bios, location descriptions, synopsis') and its extensive range of organisational and structuring tools. Its beauty lies in having every element needed for your screenplay at hand in one piece of software (i.e. I've not encountered anything that comes remotely close to Scrivener for the serious writer.
I recently downloaded the trial version of Scrivener, followed the built-in tutorial, and purchased immediately. I've probably used every piece of screenwriting software there is. Since I have used completely separate tools for each of these capabilities (namely, pen, paper and notecards), I'm not sure I'll be using Slugline for my outlining and notes, but it's good to know it's there. Slugline also offers outlining capabilities plus the ability to add notes to yourself in the middle of your screenplay.
Slugline creators think even DroidEdit Pro on Android may open and be able to edit Fountain files from Slugline. This means you can use iOS text editors like Byword and Elements to continue writing on your iPad or iPhone. While Slugline is a Mac App, you can save your files to a cloud service, like Dropbox, and open them with any text editor to keep writing in Fountain format. Don't want to type to format? Fine, Slugline will let use you use ⌘I for italics, ⌘B for bold, and ⌘U for underline. For example, to italicize, use *asterisks*. Using Fountain's rules, Slugline lets you format by typing. Fountain understands the formatting rules of screenwriting (INT or EXT means a scene heading, character names are in UPPERCASE, the next line after a character's name is dialogue, etc.).
To use Slugline, you need to know how to write in Fountain. Now, this does mean a little retraining of the brain. Slugline looks like a marriage of the two: use Fountain's rules and Slugline intuits how to format your screenplay while you write on the screen in real-time. I like a little bit of formatting in my GUI. The concept of Fountain as a simple, future-proof way to write screenplays has also intrigued me, but I'm personally not a big fan of writing in a plain text editor.