This video explains the different parts of a Solo RPG kit, how they work, and how to build your own kit (on the cheap).
Some of the free tools I use are:
Solo Gaming Tool, found at Oracle-RPG.com
Worlds Without Number Free Edition, DriveThru RPG
Stars Without Number Revised Free Edition, Drive Thru RPG
Godbound Free Edition, Drive Thru RPG
Some of the other tools I use are:
Dungeonmorph Dice, Amazon.com
Rory's Story Cubes, Amazon.com
Axbane's Deck of Many Dungeons, theGameCrafter.com
The Undercity, Drive Thru RPG
Forbidden Lands, Free League Publishing/Modiphius
Matt David's Books of Random Tables, Amazon.com
Mythic Emulator, Drive Thru RPG