ExtremeTech has posted some alternative uses for Gmail such as to-do lists, notepad, spam filter and more..
The first way of making to-do lists is to use plus addresses and filters. The plus address feature, as you'll remember from our previous Gmail feature, is the one where you can add a plus sign (+) and then any string to your gmail address without it making any difference. For example: Ben.Hammersleyfirstname.lastname@example.org is exactly the same as Ben.Hammersley@gmail.com, or Ben.Hammersleyemail@example.com, or Ben.Hammersleyfirstname.lastname@example.org, or whatever. They'll all be delivered to my address, no matter what you put after the plus sign.Read on over here.