I have written a number of programs to analyse the proportionality of electoral systems, I have updated them from time to time, and the latest versions below are bootstrap websites developed in PHP/MySql using Google Charts for the graphs (and in earlier incarnations PhpMyGraph).
Elections Proprotionality: Ireland(polls section needs to be updated)
Elections Proprotionality: UK
Ireland Elections Proprotionality (Bounce): Irish Elections Seat Bounce
UK Elections Proprotionality (Bounce): UK Elections Seat Bounce
Irish & UK Elections Proprotionality : Bootstrap page
Irish Opinion Pools Opinion Polls Pie and Bar Charts (using Google Charts)
Map of RTE LW 252: RTE LW 252 Map. A PHP/MySql CRUD application using google maps.
Social Media API Social Media API
Every time I learn a new programming language I write the three card game/Monty Hall Paradox, since its a simple enough program which requires loops, conditionals, function calls, arithmetic, input and output. So various incarnations (C, Pascal, Fortran, Cobol, Lua, Perl, Python, PHP, Java etc.) of this should be found at Monty Hall Paradox.
Another project I return to is an old college physics project which was computer simulation written in Modula-2, migrated to Pascal then written in Java. Numerical Simulation of Equipotentials.
I set up a bootstrap site to track walking statistics and graph them. Walking Stats the distance and speed and calories were tracked by the runtastic app.