general (relating to all or most people, things, or places): Is this parking lot for general use?
common (belonging to or shared by two or more people or by the people in a group): This is a project of common interest.
widespread (existing or happening in a lot of places or done by a lot of people): There was widespread opposition to the war.
prevalent formal (common in a place or among a group of people): This disease is more prevalent among younger children.
rife (very common, especially something unpleasant): It is a country where corruption is rife.
commonplace (done very often, and therefore not unusual or surprising): Robbery is commonplace in this part of town.