Check out this!
The MS-DOS programs
These programs are for MS-DOS, written in either QuickBasic or Borland C++. If you see a bug, report it to my e-mail or IRC, found here
MS-DOS Exam 2.0, programmable exam for students.
MS-DOS Area, calculate area from regular polygons, you only need lenght to know how long is each side and how many sides are in the program; unpleasantly written on C++
Database, simple inventory manager for DOS
Enjoy using this stuff!