OKVis is out to enhance and extend custom visuals and tools for Power BI. And they are offering it free of charge - under the listed MIT License. When we last checked, they had six (6) custom visuals listed:
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If you are using Power BI, be sure to take a look. And give a thumbs up the the sponsor of OKVis - sqlbi (http://www.sqlbi.com/). You can find both the visuals and the tools here: http://okviz.com/.