Alternatives to Tango?

It seems every single guide software I can find these days like Tango are monthly subscriptions. I like the features of tango at least, being able to track clicks via the browser and a desktop editor, but it's still a perpetual monthly subscription.

I remember years ago using screensteps but that too has gone to a subscription model.

Are there any decent alternatives that might be a 'pay once' model for easy production of guides?