Linter for Python docstrings, according to Google Python Style Guide.
A tool to prototype UI. Looks nice, to be tested :)
An excellent article about k-anonimity, very clear and understandable without prior knowledge :)
Articles on photography, using Open Source softwares.
To prevent Thunderbird from stripping all the previous messages in a reply, due to the presence of "--" in the first signature, in a reply, use the advanced config editor and tweak mail.strip_sig_on_reply.
Regex live editor with syntax hilighting.
Easy tool to generate favicons. Simple and efficient.