Ping-O-Matic - Service to update different search engines that your blog has updated.
Bilingua - Bilingua: your language exchange app & learning companion.
TotalPing! - Promote your blog with TotalPing!
LingQ - Learn languages by immersing yourself in a world of interesting, authentic content!
Pingler - Pingler is a tool that allows you to ping your blog or website, so that followers can know if your site is online after any update, maintenance, etc.
Mondly - Learn 33 languages in 500 bite-size lessons and 14 conversational modules.