On by Arnau Siches.

Issue 2021-W03

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This week has been about category theory, exploring HTML from the command-line, a SQL linter, visual programming and the meaning of open source.


A command-line task management tool for sequential and parallel execution of long-running tasks.


A command-line tool to explore HTML documents using CSS selectors.


A command-line tool to lint SQL.


A tool to explore ideas with visual flow programming.

Category Theory Illustrated

A book on Category Theory from a non-mathematical point of view.

Open Source is Discrimination

An article on the changes in meaning of 'open' in open source licensing, discrimination, oppression and discernment.

Licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.


Arnau Siches © 2021