- PHB
DMG
Monstrous Manual
Arms & Equipment Guide
Tome of Magic
DM Option: High Level Campaigns
Player's Option: Combat & Tactics
PO: Skills & Powers
PO: Spells & Magic
TC Bard's Handbook
TC Druid's Handbook
TC Fighter's Handbook
TC Paladin's Handbook
TC Priest's Handbook
TC Ranger's Handbook
TC Thief's Handbook
TC Wizard's Handbook
Complete Book of Dwarves
Complete Book of Gnomes & Halflings
TC Book of Elves.
The DM Toolkit contains NPC Generation, Monsters and Encounters, Treasure, Other Custom Information, Table Rolls, Import, and Export.
I'm only going to cover Other Custom Information. In there you can create Custom Classes, Powers, Races, Data that ranges from armor to weapons, and Custom Spells. This is fairly robust for when it was released in 1999.
The help documentation in the software is fairly robust while the manual isn't that useful. The problem with Windows 10 is that it no longer supports .hlp files that this program uses by default. There is a method to get it to work and just follow the instructions listed.
Also included is Pro-Fantasy's early Map Maker and Campaign Mapper software.
Under Characters you can create and store characters. Creating Characters allows you to choose between using just the core rules or the Player's Option rules.
If I get approval from @rusty_shackleford I'll post links to the software.