Scriptable is described as 'automation tool that enables you to write scripts that integrates with native features of iOS such as files, calendars, reminders, documents and much more' and is a Task Automation App in the Office & Productivity category. There are more than 10 alternatives to Scriptable for a variety of platforms, including iPhone, iPad, Online / Web-based, Android and Android Tablet. The best alternative is IFTTT, which is free. Other great apps like Scriptable are n8n.io (Free), Tasker (Paid), Integromat (Freemium) and Microsoft Flow (Freemium).
Shortify Actions lets you save actions from almost any app. An action is composed by a name and a URL, so you can save everything that has a URL. For example you could save playlists from you favorite music app or videos from the web.
HomeRun is HomeKit like you've never used before, bringing fast scene control to your Apple Watch on watchOS 6. Featured by Apple in "New Apps We Love" and "Great on Apple Watch". Named MacStories Select Best Apple Watch app of 2019.
Pushcut helps you kick off your automation when it matters. Create fine-tuned interactions for HomeKit, Shortcuts, and custom workflows through smart notifications combined with powerful automation actions.
Splash is a programming language created to help you build your shortcuts. To get started at the language you can check one of the built in examples. The app contains a text editor, to write your splash scripts and a compiler, that generates Siri Shortcuts for you.