Good film editing software and someone who knows how to use it will make a big difference in any project whether it's a home movie or a small budget independent film.
Big budget films always use professional teams and many times outsource to editing companies.
Due to relatively inexpensive cameras and editing software, amazing works of art can be created with relatively small budgets.
There are a large number of software editing packages available. Here are a number of them.
Editing software Companies and packages are:
Adobe Systems
Apple Inc.
ArcSoft ShowBiz (Microsoft Windows)
Autodesk Discreet Smoke and Discreet Fire (Linux, IRIX)
Avid Technology
Canopus
Cineform
CyberLink PowerDirector (Microsoft Windows)
DeskShare Video Edit Magic (Microsoft Windows)
Edius
FORscene (Java on Microsoft Windows, Mac OS X, Linux)