A reasonably comprehensive basic worldbook for Dragonlance, although being set post-War of Souls means having to work harder if you're more interested in say the War of the Lance era.
The PDF itself was overpriced when I originally bought it (prior to WotC's "piracy crackdown"). Fortunately you can search it - the hardcopy I've seen doesn't have an index. I'm running a game and I have to hunt around for the stats for Dragonlances, which are under special materials, not magic items.
There was also some curious game design - giving each Solamnic order a different prestige class (a rose knight is probably a fighter/cleric with three prestige classes, take Dragon Rider and Legendary Tactician to complete the set), and the Wizard of High Sorcery prestige class, requiring the wizard to be specialised, going against the well-established fluff (that the order joined is based on decisions during the Test of High Sorcery). Virtually every NPC wizard's stats I saw in splatbooks stated they had chosen not to take a specialisation. The various splatbooks did have some improvements, although Heroforge tends to be sourced from this book.
I believe 1d4chan did a more eloquent comment on the section on Kender than I could.