The first plugin I made, was nice in order to get a grip on how things work when making addons for Construct. It basically does what moment.js does but worse, and since moment.js was also created as a plugin it is since deprecated.
The second plugin I made, more getting used to the SDK. It just adds some fancyness to the regular console.logs by allowing to add icons and CSS to them.
Tweeen was absolutely the biggest addon I made. Back then Construct 3 was pretty new and there was no alternative Plugin for tweening. Though litetween was at some point ported from Construct 2, I personally had some issues with it that I felt like I could improve, so I made this. A while later an official tweening plugin was implemented into Construct and thus Tweeen was deprecated.
A little helper addon that adds some more abilities to groups, like enabling/disabling multiple sub-groups or enabling/disabling based on tags.
Another little helper addon that offers a neat way to store an objects state (or multiple states by tag) like XY position, angle, etc. and load that state back onto the object.