The interface and usage of Gmail labels to keep my inbox organized. The waiting on feature which enables me to see what emails I am waiting on a reply for is extremely helpful. I also enjoy being able to schedule emails as tasks on my Google Calendar. In addition, the fact that I can create lists based on David Allens Getting Things Done methodology helps me with my productivity. Review collected by and hosted on G2.com.

Its only for a one-person organization. For larger projects you'll want to consider something like Clickup or Asana (I recommend Clickup over Asana) Review collected by and hosted on G2.com.