Tools for Twitter text?

I'm interested in tools that generate what I think of as "Twitter Text."

by Dave Winer Friday, November 25, 2016

I'm interested in tools that generate what I think of as "Twitter Text".

Here are a few examples.

Each of them presents a quote, as a bitmap, obviously rendered through a template.

I'm wondering what kinds of tools exist for creating these?

I imagine some of them are done in Photoshop, but I'm thinking of a text editor that automatically generates them.

I have good HTML 5 canvas code. You can try it out with Little Card Editor, which produces somewhat similar results. Also there's a video demo.

I've turned on comments on this post, looking for links to existing products, experience using in-house tools, etc.