Bodyweight Exercises

You Are Your Own Gym and Convict Conditioning are both decent bodyweight programs

Most of the workouts I do are body weight with handweights as well.
Push ups
Plank
squats
walking lunges
bicycle crunches
Russian twists
walking planks (plank position with elbows on the floors, switch from elbows to hands and back)
Burpees
wall sit
hip thrusts
leg curls
I could go on and on....
Some inexpensive equipment you can use at home are hand weights, yoga mat, medicine ball and bosu ball.
You can also find some good body exercises on pinterest. Your body is your best exercise equipment!