What's one app you use a lot to facilitate your daily life and that most people don't know about ?

Question

It could be a new product, or one that's been around for a while, but has flown under the radar.

EGon · Accepted Answer

For me; TooGoodToGo  
When I have no time to do some shopping at the supermarket, this app offers you much-unsold food from a restaurant or supermarket. This reduces food waste and enables me to do one or two lunch for two/three € 
I'm french and I don't know if this app is available in other countries

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What's one app you use a lot to facilitate your daily life and that most people don't know about ?

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