If you incorporate more standing and walking during the day you will burn more calories without having to go to the gym. [1][1]
Stand up at work (and at home). Try not to sit in an office chair or on the couch for hours on end.
To your list of exercises I would add two elements:
- some kind of sit-ups or crunches to work the abdominal muscles
- pull-ups or curls to work the biceps
Burpees are also a good full-body exercise that can burn a lot of calories. There are quite a few variations to work extra muscle groups. [2][2]
[1] http://www.livestrong.com/article/73916-calories-burned-standing-vs.-sitting/[1] http://www.livestrong.com/article/73916-calories-burned-standing-vs.-sitting/
[2] http://en.wikipedia.org/wiki/Burpee_%28exercise%29[2] http://en.wikipedia.org/wiki/Burpee_%28exercise%29