I made Climatescape after seeing dozens of people go through a similar process of cataloging interesting climate-focused companies in spreadsheets, notes, and elsewhere. The goal is to unify these efforts and provide the content free to anyone who might find it useful. The website is open source[1] and content is Creative Commons licensed.
This is really just the beginning of what I'd like to see the project become. We want to go deeper by including key org attributes like headcount, location, investments, and more. There are also plans to increase the breadth of the database by including books, podcasts, events, data sets, and other important resources related to climate.
If anyone is interested in contributing please get in touch! brendan [at] sinceresoftware.co
[1]: github.com/bloudermilk/climatescape