Common utilities
Desktops/Graphical User Interfaces
Multimedia
Database Servers
Database Clients
Network Services
Security Auditing
Network Utilities
Filesystems
Filesystem Utilities
Desktop Publishing
Conversion
... April 3 - Sally Rand[?], dancer (+ 1979) April 7 - Ralph Bunche[?], diplomat, winner of the Nobel Peace Prize April 16 - Fifi D'Orsay, actress (+ 1983) April 22 - ...