I've released three libraries for Kotlin/Java:

• Bitly Shortener

  A simple implementation of the URL shortening (bitlinks) abilities of the Bitly v4 API.

  bitly.bitlinks().shorten("https://www.example.com/")

• is.gd Shortener

  A simple implementation of the is.gd API for URL shortening.

  Isgd.shorten("https://www.example.com/")

• Akismet

  A pretty complete and straightforward implementation of the Automattic's Akismet API, a free service which can be used to actively stop comments spam.

  val akismet = Akismet(apiKey = "API_KEY", blog = "https://www.example.com/")
  
  val comment = AkismetComment(request = context.getRequest())
  val isSpam = akismet.checkComment(comment)