Hi Annonce is an app that help you publish ad to sell objects in a very easy and fast way : just put a photo, a price, and a short description with keywords an you are ready to sell. The search is as easy: you have a list af keywords you are interested in, just select one and you got all related goods around you are shown.
On the main screen you can add your most usefull keywords. Just select one of this, and it show you all releted ads.
When watching an ad, sending an email or calling is just one click away
If keywords is not enough, or if you need more criteria, there is a search screen for you.
All this is free.