LogSec for students, project organization, and the aspiring corkboard conspiracy theorist in your life wanting to be the next Mark Lombardi. Use markdown in a free flow style notes app that has powerful tools to connect ideas, so you can focus on the information as opposed the organization. Semantics instead of syntax, as it were.
What lesser known free and open source software do you use daily to improve your life?
For me it is the note taking/PKMS tool SilverBullet.