AnyConnect：官方可以查看各文件的SHA512或MD5， 但需要授权才能下载：
AnyConnect Secure Mobility Client v3.x
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 3.0
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 3.1
End-of-Life Announcement for the Cisco AnyConnect Secure Mobility Client Version 3.x
AnyConnect Secure Mobility Client v4.x
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.0
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.1
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.2
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.3
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.4
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.5
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.6
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.7
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.8
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.9
Release Notes for Cisco AnyConnect Secure Mobility Client, Release 4.10
Shadowsocks：参考官网说明下载：http://shadowsocks.org/en/download/clients.html