::[https://octopart.com/ Octopart] - Lets you search for transistor datasheets but also allows you to filter by key specifications much like AllTransistors cross reference.
===Hardware pinouts (web-based)===
::[https://allpinouts.org/ allpinouts.org] - is a Web-based free content project to list cable and connectors pin-outs.
::[https://pinouts.ru/ pinouts.ru] - Handbook of hardware schemes, cables and connectors layouts pinouts.
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