1. Pentest WikiPENTEST-WIKI is a free online security knowledge library for pentesters / researchers. If you have a good idea, please share it with others.
2. FuzzdbWeb Fuzzing Discovery and Attack Pattern Database
4. LabsVulnerability Labs for security analysis
5. nmap vscannmap service and application version detection (without nmap installation)
6. checksecA windbg extension for ASLR/DEP/SafeSEH check