Meika Hime & Mikoto are voicebanks intended for use within the VOCALOID5 software. Though, upon further digging, I found a version that can be used within VOCALOID4 and 3.  Download Here 

  While Vivi herself is on longer cancellable hiatus, someone leaked her voicebank elsewhere. She isn't the absolute best, but well enough she's still in development. Install her off of archive.org and you should be good to go, no promises though, she has a few bugs. Download HERE.

  MAIDLOID voicebanks can be super hard to find nowadays considering the product has sorta fallen in and out of obscurity. Well, if you're actually looking for Acme Iku (the current most popular one) then you're in luck. I have the link to a download of the sample version only, it can't use all of the features, but it is useable to some degree and can still make noise, show photos, etc. MAIDLOID IS NSFW AND IS MEANT TO BE USED BY THOSE 18 OR OLDER [or whatever the age of consent is in your country of viewing]. Installation is quick, you might have to install flash. It runs on Flash 10 just fine! Won't work on flash projector though. Download demo version HER E   Also, to the luck of those musically inclined, Iku has an UTAULOID port, right HERE!

   Hey I'm here again, this is the first voicebank to ever be uploaded to the site. Yay! So, I have download links to the sugar and spice variants of Una! These do NOT work on official copies of the Vocaloid 4 editor. To use the voices within the editor, open the rar file, extract the apk, run the apk, and go through the installation process. Then, boot up your editor and you should be good to go! Download Otomachi Una V4 Here