This is a pretty good Starbucks. It's open til around 10, and there's a nice fireplace inside. There's lots of seating, but it's almost always hard to get a seat. People using laptops and Tufts students doing homework occupy them.
Diesel offers a relaxed atmosphere condusive to productivity if you are accustomed to working with the usual buzz of a coffee shop. Diesel offers all the usual accoutrements to be expected by a modern cafe including wireless internet, couches, a variety of deserts and caffeinated beverages.
J.P. Licks offers a variety of homemade ice cream and non-fat frozen yogurt. Their bittersweet hot fudge and butterscotch are made from unique scratch recipes. They make all of their ice cream and roast their own coffee in their original, Jamaica Plain location (which they term their "Mother Ship").
Bakery and Cafe. A great long time Davis Square Lanndmark featuring lots of traditional Italian treats, fantastic Rum Cake, friendly neighborhood atmosphere.
A typical Dunkin' Donuts, except that it cuts prices on some items after 7PM. It also advertises free wi-fi in store. It's open from 4:30AM to midnight, not quite 24 hours like the one in Porter.
Panera Bread bakery-cafes bring the tradition of freshly baked artisan bread to neighborhoods in cities throughout the country.
Bhoja Café, is a sunny coffee-and-sandwich bar owned by the same family that runs the tasty Tibetan restaurant, Martsa's on Elm, next door.
Au Bon Pain means "the place of good bread" in French. Au Bon Pain claims to be a stylish bakery cafe located at "America's urban junctions and suburban crossroads". They're a pretty big chain, especially locally, if you haven't noticed.