General:
* Recycle
* Repurpose
* Reclaim
* Re-employ
* Re-utilize
* Upcycle
* Refurbish (for objects)
* Salvage
* Revive
More specific:
* For materials: Re-process, reclaim, recover, regenerate
* For items: Re-fashion, restore, repair, remodel, renovate
* For information: Re-publish, re-issue, re-circulate
The best synonym will depend on the specific situation and what you want to emphasize.