PC Tools
PC Tools publishes highly trusted, award-winning PC software, including Spyware Doctor, Registry Mechanic, Free AntiVirus, Firewall Plus and Spam Monitor, which protect the privacy and security of Windows? PC users.
Avira(小红伞)
Windows and Linux anti virus, firewall, anti spam, recovery solutions against malware infection - Avira AntiVir.
Avast
The main interest of ALWIL software is in developing protection against computer malware, which is spread mainly on the internet and via other data media. antivirus software is based on in-house developed antivirus technology.
ZoneAlarm
Award winning antivirus, internet firewall and computer security software by ZoneAlarm, including virus scan and anti-spyware protection for Windows Vista and XP.
冠群金辰软件公司
KILL安全产品包括：KILL终端安全和KILL网关安全两大系列，以及KILL防火墙，入侵检测，漏洞扫描等众多安全产品。KILL终端产品有KILL杀毒软件和KSMS终端安全管理系统，KILL过滤网关屡获殊荣并居安全网关市场的领导地位。
北京安博士信息安全技术有限公司
AhnLab Inc. 国际知名网络安全综合解决方案提供商，拥有超过20年的专业反病毒经验，全球网络安全行业的先驱者，提供从个人终端到企业网络、从反病毒软件到UTM硬件产品的完整解决方案。下载我们专业、安全、易用的免费试用版软件。
Virus Bulletin
Independent malware journal and website with advice, reviews and tutorials.
SecuriTeam
Beyond Security will help you expose your security holes and will show you what the bad guys already know about your hosts and network.