You can check it out from your own instance by going to https://t.lemmy.world/ (that might be an older version though? at one point Tesseract development was frozen but then it later resumed).
Your instance sidebar also mentions several other alternative UIs:
I have no idea what tesseract is and at this point, I’m too afraid to ask.
It’s a front end layout that makes for fancy visual customization of lemmy.
You can check it out from your own instance by going to https://t.lemmy.world/ (that might be an older version though? at one point Tesseract development was frozen but then it later resumed).
Your instance sidebar also mentions several other alternative UIs: