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. KeywordTool.io supports 83 different languages and 194 Google domains.
This handy tool for online marketing enthusiasts and Search Engine Optimisation (SEO) / Search Engine Marketing (SEM) researchers was Co-Founded by my friend Artem Galimov and me. The clean and User-Experience oriented design is using Twitter's Bootstrap with a little personal touch.