Plugin for automation applications

Need to automate the process of creating photos, processing and posting on social networks
something like workflow on iOS, but user can run a script in a few touches
More in detail describe the task in person. Not an expert, understand the task, only functional instruments of implementation is not clear to me, so if not in that section wrote, if you please, sir
Restrictions on the platform there as you can on the Win and for Android and iOS
Cost, honestly, don't fully understand how much it may cost, I am ready to discuss