I spent the last month combing and classifying through the crypto-technology market, and what started like a 3-day spreadsheet project with an expectation of reaching 100 companies, mushroomed into a large publishable database of 425 companies, spread across 64 sub-categories. The data now resides in an open “Silk”, a powerful Web service for publishing data. The various companies are classified into 4 major categories, as depicted by this graph: Here’s how the company count distribution stacks up, according to this donut graph.  

http://startupmanagement.org/2015/03/03/the-crypto-technology-and-bitcoin-landscape/