If you could revive one discontinued app, and launch it on Product Hunt, what would it be?

My girlfriend and I met all the way back in 2012, and for the first few years of our relationship, we were constantly chatting via MSN messenger... And then Microsoft shut it down. Man, I freak'n loved that app. The nudge feature was amazing -sure, it was interruptive, but it was also cute, in a way. Emojis were awesome, you had custom fonts and font colors - kinda like personalization you had for MySpace, only for DMing. It felt way, way more personal and intimate than your Whatsapps and FB Messengers of today. So that got me thinking - any ancient gems you guys loved, that shut down, and you'd like to revive and (re)launch on Product Hunt?