Actually,there have been many alternatives to Spritz Popping up lately,here are a few depending on what your using:

IOS:
http://tinyurl.com/IOS-Speed-Reader
(As well as many others,search speed read in the appstore)

Android:
http://tinyurl.com/Android-Speed-Read-App-1
http://tinyurl.com/Android-Speed-Read-App-2
http://tinyurl.com/Android-Speed-Read-App-3
(As well as many others,search speed read in the playstore)

Firefox Bookmarklets:
http://tinyurl.com/RSVP-bookmarklet
http://tinyurl.com/RSVP-bookmarklet1
http://tinyurl.com/RSVP-bookmarklet-2

Firefox Extensions:
http://tinyurl.com/Speed-read-addon-1
http://tinyurl.com/Speed-read-addon-2

Chrome Extensions:
http://tinyurl.com/readline
http://tinyurl.com/Spreed-1
http://tinyurl.com/jetzt2

Windows EXE's:
http://tinyurl.com/Speedreader-enhanced


Online Websites:
http://tinyurl.com/Spreeding-website-1
http://tinyurl.com/Spreeding-website-2