Here are a few resources that I've developed for conferences and workshops that I've attended and for which I've given presentations.
Mathematical Sciences Research Institute (MSRI) Graduate Student Workshop, Summer 2002. I developed a small program to investigate acyclic autocorrelation of sequences of roots of unity. In doing this, I practiced literate programming with the noweb system.
AMS Sectional Meeting, 2006 (Lincoln, NE). I was invited to give a presentation on my current research on the minimum rank problem. My slides are here: minimum-rank-lincoln-slides.pdf.
MAA Iowa Sectional Meeting, 2010 (Coe College, Cedar Rapids, IA). I gave a talk on SageTeX. My slides are here (source for the slides is here). I've used several yet-to-be released features, though, so some examples may not work on the currently released version of SageTeX and Sage.
AMS/MAA Joint Meetings, 2011 (New Orleans, LA). I gave a talk on an open-source linear algebra book and approach initially written by Ben Woodruff. My slides are here. The book is here.
AMS/MAA Joint Meetings, 2013 (San Diego, CA). I gave a talk on the Sage Cell Server. My slides are here.