Coisas Que Eu não Preciso Mais is an app for all the things we dont want anymore. Works as follows:
Post a product, category and price you want to sell it (may be zero). If someone is interested, the person comments in the post and They can combined to buy, sell, exchange, give or receive it.
In case of purchase, sale and exchange, within that post, They combines it all: value, delivery condition.
Of course everything should be done with great care and attention.