An nit file extension is related to the ArcView, a GIS software. An nit file contains table definitions.
Software that open nit file
NIT file extension - ArcView INFO table definitions
What is nit file? How to open nit files?
File type specification:
The nit file extension is associated with the ArcView (also known as ArcGIS Basic), a geographic information system (GIS) for Microsoft Windows, developed by ESRI.
The nit file stores INFO table definitions.
The default software associated to open nit file:
ArcGIS for Desktop Basic (ArcView) 
Company or developer:
Esri
ArcGIS for Desktop Basic (formerly known as ArcView) is GIS (geographic information system) application used to visualizing, managing, creating, and analyzing geographic data.
ArcGIS for Desktop Basic is a part of the ArcGIS Desktop. ArcGIS for Desktop Basic supports creation of interactive maps, spatial analysis, GIS deployment, map viewing and navigation, map printing etc.
List of software applications associated to the .nit file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open nit file, edit nit file, convert nit file, view nit file, play nit file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting nit files.
Software that open nit file - ArcView INFO table definitions
Programs supporting the exension nit on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about ArcGIS for Desktop Basic (ArcView) for open nit file action.
