The featureful Photon fork Tesseract is now available to use at tes.leminal.space. It has significantly advanced upon Photon's already excellent interface and really come into its own. As such, the list of features is extensive, so I encourage you to check out the repo for a full description if you're interested. Tesseract also works well on mobile, especially when installed as a PWA, so give that a try, too.

If all goes well, it's likely Photon will be retired in the next couple of weeks with Tesseract taking its place. (EDIT: This has now been implemented.)