I'm not an expert (other's on here are) but,
for a start, wrong forum; everyone in the weight training forum has always used wieghts.
Please explain why no weights? Bruce Lee used weights effectively:
If you don't use weights you're only be using your body weight instead.
I think what you mean is - exercise I can do without being in a gym. In which case you could try:
- sand bags
- bottles of water with handles
- chin bars
and all the usual exercises:
- situps etc
- plenty more I'm sure
When my gym membership runs out I'm gonna see if I can work as hard without joining a gym. The biggest problem I suspect will be motivation; just going somewhere helps.