These are my favourite links!

• Kisekae 2
  Anime/manga-styled character creator. You can really make whatever you want so long as you get creative with the tools. You can find my own Kisekae creations on the main site. This game is NSFW.
• DragonCave
  Pet collector game where you get dragons, get people to click on them for them to grow, and breed them. Less genetics-focused than something like Flight Rising, and a lot less complicated. I love it!
• Metazooa
  Wordle-type game where you try to guess a species by guessing other species to reveal its taxonomy. Can be really easy, or really hard! Fun way to expand on your taxonomy.
• Aladin Sky Atlas
  A free, web-based sky atlas. I like using Galaxy Zoo with this because I can take the data from galaxies I find on Galaxy Zoo and look at them on here. There's a lot of data you can look through and you can see some deep-space objects if you know where to look!
• Galaxy Zoo
  Citizen science project where you help astronomers categorise galaxies. This is one of my favourite websites. Educational, calming, and a great time-waster that is technically productive.
• VentuSky
  Shows wind, pressure, temperature, and more meteorological goodies.
• iLovePDF
  So many great, free, online PDF tools.
• Twente WebSDR
  Online radio that can listen to many stations across the world Numbers stations, North Korean stations, pirate radio? All here, all for free, and with a chat to share discoveries. A favourite of mine since I was young.
• Biblioteca Pleyades
  A massive, multilingual library of New Age and conspiracy articles. Easy to get lost in, fun to read regardless of if you believe in any of it.