Finding good apps can be a daunting task with millions available. To help you sort through this overwhelming selection, you should visit AppCrawlr.com - a web site that lets you filter and search for Apple, Android and Windows apps by category, price and other criteria.
There are even apps that let you search for apps. One of my favorites for Apple apps is AppsGoneFree; every day it lists 5-7 apps that are free for a short time. I check it frequently and have found many great bargains.