In terms of developing:
Best: made a responsive web app that connects to a desktop software and allows to make orders for providers.
Worst: the company for wich it was developed shows no signs of implementing that app now.

Can you please tell more about what the app does?

@delphiboy sure. This company has employes that "sell" their products in the morning, and then they return to their office with the orders and start to fill their trucks to distribute them in the afternoon (around 4 pm).
This web app allows them to place the orders via mobile internet in their smartphones, and the software they use in the office retrieves all this new orders, so they can start to fill the trucks much earlier, gaining time, money, and making the delivery much faster.

To this day, the company has seen the web app working with their actual software, but still hasn't call to implement it, nor they respond when I'm calling them ("our boss will call you, he's been busy this days").

Money loss for them and me also :/

But I've learn a lot working on it, so it's a win also for me.

@juankortiz I was not given any money for some of my projects too, but I have always looked at the positive side which is learning a thing or two. Both sad and cool.