What are the best free android apps? (video,internet,funny,...)
Android WiFi Analyzer,
a must have if you want to survey an area with your phone
I agree WiFI Analyzer is a great tool but a great app to go along side it for network information is "Overlook Fing"
Best app is a very subjective topic, still to answer your question I found Messanger, WhatsApp, Zomato, Vimeo very helpful. Apps keep releasing every month which are really good.
You can refer best app of September 2017 here: = https://www.youtube.com/watch?v=9eH0-8AnnGQ