I've been using some programs and apps to help me stay organized and (mostly) productive for a while.
I use Google calendar to note when presentations, revisions, mechanicals, etc are due so I can see it visually at a glance. I try to always note those dates in my calendar while checking and responding to emails so I don't forget.
Recently I noticed a new feature in Gmail on the right sidebar that has a task list. I've started incorporating that into my daily workflow as well, noting anything that comes up or I think of that I need to get done.
Unroll.me is a fantastic tool that I've been using for a few months and has really cut down on the amount of time I have to sort through email. If you're not using it, I highly recommend it! It's free and absolutely wonderful.
I also use Google Sheets to track my finances, income, projects (and the status of each project), expenses, time spent working (for my own inquisitive mind as a freelancer), etc.
Watching the Productivity Masterclass video, I decided to try Todoist. See how it can help my workflow and sporadic mind keep track of my random lists of things to get done. I've watched other videos on YouTube, looked at random blog posts about Todoist and after getting started, am having a better understanding of how to make it work for me.
My next step for the weekend (on my Todoist) is to research Evernote more and get started in that application/program. I research alternative options, especially cost-wise, but realized that Evernote would probably work best for my needs in the long run once I get a better understanding of how to utilize it for myself.