You can pretty much find an app for everything these days. Here’s a cool one that will help you stay in shape and on top of your tennis game at home and when you travel. Tennis Buddy is a location-based app that connects tennis players with others in the area, filtering by age, gender, distance and skill level. Last month they had more than 8,000 users, with functionality in 10 cities (each with more than 200 people in search of a game of tennis). And it’s free!