Soovle is a free keyword tool that lets users find keyword variations and search suggestions across multiple search engines including Google, Amazon, YouTube, Bing, Yahoo!, Pinterest, Answers.com, and Wikipedia. Users can select up to six sources at a time, star preferred results, export their starred keyword lists, and use the exported keywords to develop content topics, page titles and headings. Soovle does not display keyword data such as search volume, keyword difficulty or cost per click.
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lastmuseum.com
The Last Museum is a semantic search engine indexing public museum collections, allowing searches by theme, style, subject, or description. The site states it currently has around 6 million artworks indexed and is free to use, and that it is not affiliated with museums and does not own the images.