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Web tool that tells you how well colour combinations work, with simulations of various forms of partial vision. (It has the usual limitation that is your site uses translucent backgrounds or ink you need to screen shot it and find the effective colours via your favourite graphics editor’s eye dropper.)
(Via @aneventapart on Twitter)
Blacklight shows you the trackers on a web site. Or you can use it to verify that a site does not track you.
This links to the report for my own link-noting web site pdc.ooble.uk.
(Via @meyerweb on Twitter)Noted by Damian Cugley .
An automatic conlang generator. If your fantasy or sf story needs some made-up languages for local colour, you can generate one here.
A tool for experimenting with the proposed CSS color-mod functions. I find it useful even without browser support: I enter a CSS colour, fiddle with knobs like alpha and lightness, and see the resulting colour in CSS format I can copy in to a stylesheet.
Check whether your email address or favourite password has turned up in any of the many security breaches in online services.
Cog is a nifty code-generator utility done with python scripts hidden in comments in the source files, so the generated code is OK to check in to source-code control. Useful for repetitive compiled-in data, or for filling in gaps in the syntax of the host language.
Given a keyboard layout created on Keyboard Layout Editor, you can create files for cutting a plate and possibly a case automatically.