As requested, here are links to the SRDs. The SRDs contain most of the core rules and are available online for free from WotC.
D&D 3.5 SRD
D20 Modern SRD
Open Gaming Foundation SRD (Unreleased Portions)
Errata
Player's Handbook v3.5 Errata (15k ZIP)
Other Errata
D&D 3.5 SRD
D20 Modern SRD
Open Gaming Foundation SRD (Unreleased Portions)
Errata
Player's Handbook v3.5 Errata (15k ZIP)
Other Errata
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