Bizness Apps - Create your own app or become a reseller and build apps for others
KeywordTool.io - KeywordTool.io is the best FREE alternative to Google Keyword Planner and Ubersuggest. It uses Google's autocomplete feature to get over 750+ long-tail keywords for any given query.
Siberian CMS - Siberian is an Open-Source and Free App Maker. Unlimited Push Notifications. Unlimited features. Fully Customizable. Download it and build your own app now!
Google Trends - Explore Google trending search topics with Google Trends.
Dropsource - Mobile development platform for building native iOS & Android apps
Keywords Everywhere - Free browser add-on for keyword volume, CPC & competition