There is no easy answer to this question as it depends on the specific area of civil engineering you are talking about. For example, some civil engineers might use a lot of architectural software, while others might use more survey or construction management software.
That being said, there are a few software programs that are used quite frequently in civil engineering. Autodesk Civil 3D is a popular program that is used for designing, analyzing, and documenting civil engineering projects. another popular program is MicroStation, which is used for 2D and 3D design and drafting.
So, while there is no definitive answer to this question, these are a few of the most popular software programs used in civil engineering.