Even if you are a full-time employee of a company who just happens to work remotely, working from home puts much more of the burden on you to manage your projects and deadlines. And if you are self-employed, this is so much truer.
I'm not naturally prone to using lists and calendars and generally organizing things all that well, but I have learned to create and maintain systems without which I would have no idea what to prioritize and when.
While you can use programs like Slack and Trello to organize your workload and coordinate with colleagues who also work remotely or work in an office, one of the best platforms is simply Google. Between Google's calendar, with its customizable reminders, and Google Drive, which allows you to access files from anywhere, Google software is a force multiplier when you are your own human resources team. And it's free at that.