Наткнулся тут на один ресурс бесплатных книг по разным тематикам.
Решил поделиться

Вот перечень топиков.

Languages C C++ XML/XSL UML Perl Python Tcl/Tk Ada Lisp Assembly
Fortran Prolog Ruby Cobol Basic Scheme Misc Programming uages More ...

Java/J2EE Core Java Advanced Jakarta Struts Servlet/JSP Spring/Hibernate J2EE/EJB
Enterprise Security Distributed Computing GUI Multimedia J2ME More ...

Unix/Linux Core Unix Core Linux FreeBSD Security Shell Programming Networking
Unix/Linux Programming System Administration GUI/X Windows Text Editing More ...

Computer Science Data Structure/Algorithms How to Program Languages Compiler OS
Numerical AI/Logic Prog Functional OOD/OOP Computation Misc Architecture More ...

Databases Systems SQL Oracle DB2 Sybase MySQL PostgreSQL Misc More ...

Web PHP Programming JavaScript, AJAX DHTML/CSS Site Design Publishing More ...

Networking General Networks TCP/IP Management Programming Internet More ...

Advanced Topics Software Engineering Security Version Control Game LDAP Certificates
Signal Processing Bioinformatics Cryptography Reference TeX/LateX Statistics Graphics
Hardware & PC Science Mainframe Open Source Information Math Human More ...

Надеюсь найдете полезным.

Еще один ресурс ресурс.
Книг поменьше, но думаю что тоже будет интересно.