Cacoco is a visual editor, primarily SBARDEF lumps, and hopefully soon other ID24 features.
(At this point, I think you could even call it an IDE for SBARDEF... is that too much? I totally forgot to hold down the ctrl key in that GIF for Direct Selection...)
There's a lot of good features, but I'm kinda tired, and I'll write a lot more later when I get less tired.
You're going to need to use an SBARDEF compliant sourceport like the dev builds of Helion or Woof.
Build it in the same way you build a rust application in your environment of choice, or I have a few precompiled release available. Check the nightly for the latest features and fixes!
...Yeah, I'll write a better landing page soon, I promise! ^^;; For now, you can look at some random feature demonstrations on the wiki!
Thank you to NightFright's great work on their SBARDEF mod for Woof for inspiration, and many, many others to help crack the spec sheet. I hope this tool makes development easier.
Please tag me @lizzieshinkickr if you make something cool with SBARDEF! Or if you add SBARDEF features to your source port! Not for any necessary legal or attribution reasons, mind you, but because I genuinely want to see some wonderful creative stuff! Oh, and yeah, if you have any questions about actually implementing SBARDEF.

