Online Books

Bookx24x7 (Rate)

Their website contains a library of online books. They allow a limited 7 day trial with an annual subscription.

NetLibrary (Rate)

Their website contains a library of online books. To use their services, you create a free account, then purchase eBooks of your choice.

InformIT (Rate)

Their website contains a library of books and information in various technical areas that is available to members. Membership is free.