Comentar que en la mayoría de servicios se requiere de registro de datos...


Wiki: http://es.wikipedia.org/wiki/Red_privada_virtual



OpenVPN: (D.Directa para windows 7 o >, para XP o Linux visitar página de descargas)
Web: https://openvpn.net/
Descarga: https://openvpn.net/index.php/open-source/downloads.html
D.Directa (x32): http://swupdate.openvpn.org/community/releases/openvpn-install-2.3.4-I603-i686.exe
D.Directa (x64): http://swupdate.openvpn.org/community/releases/openvpn-install-2.3.4-I603-x86_64.exe
Guia: https://openvpn.net/index.php/open-source/documentation/manuals.html 
      https://openvpn.net/index.php/open-source/documentation.html
Source: http://swupdate.openvpn.org/community/releases/openvpn-2.3.4.zip
S.O móviles:
iOS: https://itunes.apple.com/es/app/openvpn-connect/id590379981?mt=8
Andriod: https://play.google.com/store/apps/details?id=net.openvpn.openvpn&hl=es



Comodo EasyVPN (Comodo Unite):
Web: https://www.comodo.com/home/download/download.php?prod=comodounite
D.Directa (x32): http://cdn.download.comodo.com/cunite/download/setups/CUnite_Setup_XP_Vista_x32.exe
D.Directa (x64): http://cdn.download.comodo.com/cunite/download/setups/CUnite_Setup_XP_Vista_x64.exe



Steganos Online Shield VPN:
Web: https://www.steganos.com/us/products/vpn/online-shield-vpn/features/
Descarga: https://www.steganos.com/en/products/vpn/online-shield-vpn/download/
D.Directa: https://file.steganos.com/software/downloader/steganos/sosintdle.exe
S.O móviles:
Andriod: https://play.google.com/store/apps/details?id=com.steganos.onlineshield



Hotspot Shield:
Web: http://www.hotspotshield.com/
D.Directa: http://mydati.com/download/hss-win2/HSS-install-e-550-plain.exe
Info: http://www.hotspotshield.com/learn/what-is-a-vpn 
S.O móviles:
Android: https://play.google.com/store/apps/details?id=hotspotshield.android.vpn&hl=es



Cyberghost VPN :
Web: http://www.cyberghostvpn.com/es_es
Descarga: http://www.cyberghostvpn.com/es_es/descarga/windows
D.Directa: http://download.cyberghostvpn.com/windows/CG_5.0.13.17.exe
Guia: https://support.cyberghostvpn.com/index.php?/Troubleshooter/List
S.O móviles:
iOS: https://itunes.apple.com/es/app/cyberghost-vpn-hotspot-schutz/id583009522?mt=8
Android: https://play.google.com/store/apps/details?id=de.mobileconcepts.cyberghost

Mac OSx:
Web: http://www.cyberghostvpn.com/es_es/descarga/mac
D.Directa: http://download.cyberghostvpn.com/mac/cg5mac_5.0.13.18.dmg



TunnelBear:
Web: https://www.tunnelbear.com/
Descarga: https://www.tunnelbear.com/download/
D.Directa: https://tunnelbear.s3.amazonaws.com/downloads/pc/TunnelBear-Intellibear.exe
Guia: http://help.tunnelbear.com/
S.O móviles:
iOS: https://itunes.apple.com/us/app/tunnelbear/id564842283?ls=1&mt=8
Android: https://play.google.com/store/apps/details?id=com.tunnelbear.android

Mac OSx: https://www.tunnelbear.com/wp-content/themes/reverie/images/tunnelbear/icon_mac.png



Your Freedom:
Web: http://www.your-freedom.net/
Descarga: http://www.your-freedom.net/index.php?id=3
D.Directa: http://ems12.your-freedom.de/download/freedom-20140903-01.exe
Guia: http://www.your-freedom.net/index.php?id=172
S.O móviles:
Android: https://play.google.com/store/apps/details?id=de.resolution.yf_android

Mac OSx: http://ems12.your-freedom.de/download/Your%20Freedom%2020140903-01.osx.zip
         http://www.macupdate.com/download/27958/freedom.dmg   
 


VPNReactor:
Web: http://www.vpnreactor.com/
Descarga:
D.Directa: https://secure.vprsecure.com/OpenVPN/VPNReactor.exe
Portable: https://members.vpnreactor.com/OpenVPN/VPNReactor_Portable.zip
Guia: http://www.vpnreactor.com/setup_tutorials.html
S.O móviles:
iOS: https://www.vpnreactor.com/iphone_pptp.html
Android: https://www.vpnreactor.com/android_pptp.html

Mac OSx: https://secure.vprsecure.com/downloading_vpn_client_for_mac.html
         https://secure.vprsecure.com/OpenVPN/VPNReactor.dmg



ProXPN:
Web: http://proxpn.com/
Descarga: http://proxpn.com/download.php
D.Directa: http://proxpn.com/installproXPN.exe
Guia: http://proxpn.com/#how
S.O móviles: Para verisiones móviles/tablet se requiere cuenta premium...
iOS: https://itunes.apple.com/us/app/proxpn-vpn-anonymous-ip-protect/id546557458?mt=8
Android: https://play.google.com/store/apps/details?id=com.proxpn.proxpn&hl=es

Mac OSx: http://proxpn.com/mac.dmg



PrivateTunnel:
Web: https://www.privatetunnel.com/
D.Directa: http://swupdate.openvpn.org/privatetunnel/client/privatetunnel-win-2.3.exe
Guia: https://www.privatetunnel.com/index.php/kb-using-private-tunnel.html



USAIP:
Web: http://usaip.eu/en/index.php
Descarga: http://usaip.eu/en/free_vpn.php
D.Directa: http://usaip.eu/en/vpnautoconnect.zip
D.Directa (Windows 8):http://usaip.eu/en/vpnautoconnect8.zip
Guia: http://usaip.eu/en/setup_faq.php
S.O móviles:
iOS: https://www.usaip.eu/en/tutorial_iphone.php
Android: https://www.usaip.eu/en/tutorial_vpn_android.php

Mac OSx: https://www.usaip.eu/en/tutorial_mac_os_x_lion_pptp_setup.php



SpotFlux:
Web:
Descarga: https://www.spotflux.com/#download
D.Directa: https://www.spotflux.com/downloads/sf-install-web.exe
S.O móviles:
iOS: https://itunes.apple.com/us/app/spotflux/id592453110?ls=1&mt=8/ios-a/
Android: https://play.google.com/store/apps/details?id=com.spotflux.android

Mac OSx: https://www.spotflux.com/download/mac
         http://download.raptorvpn.com/mac/release/2.11.0-27/spotflux-2.11.0-27.dmg



OkayFreedom:
Web: https://www.okayfreedom.com/
D.Directa: http://software-files-a.cnet.com/s/software/13/29/92/88/okayfreedomintdle.exe?token=1413389156_9b2ae493083136f7c0aacf938853203d&fileName=okayfreedomintdle.exe
D.Directa_2: http://download.cnet.com/OkayFreedom-VPN/3000-2144_4-75750183.html?part=dl-&subj=dl&tag=button (Elegir mejor la descarga directa, evitareis el downloader de CNET)



JAP (Anonymity & Privacy): Requiere Java.
Web: http://anon.inf.tu-dresden.de/index_en.html
D.Directa: http://anon.inf.tu-dresden.de/win/japsetup.exe
D.Directa_2: http://anon.inf.tu-dresden.de/win/jap_all/japsetup.exe (incluye java)
Guia: http://anon.inf.tu-dresden.de/help/jap_help/en/help/index.html

Mac OSx: http://anon.inf.tu-dresden.de/mac/JAP.dmg
Guía: http://anon.inf.tu-dresden.de/mac/download_en.html


VPN Gate:
Web: http://www.vpngate.net/en/
Descarga: http://www.vpngate.net/en/download.aspx
D.Directa: http://download.vpngate.jp/common/cd.aspx/vpngate-client-2014.10.15-build-9505.130866.zip
Guia: http://www.vpngate.net/en/howto_l2tp.aspx#ios
S.O móviles:
iOS: http://www.vpngate.net/en/howto_l2tp.aspx#ios
Android: http://www.vpngate.net/en/howto_l2tp.aspx#android

Github: https://github.com/SoftEtherVPN/SoftEtherVPN/
Source: http://www.softether.org/5-download/src


Hay otras alternativas a instalar un software, por ejemplo la configuración y creación de una red VPN desde tu sistema:

http://www.itshidden.eu/
iOS: https://itunes.apple.com/us/app/itshidden-vpn-for-ipad-iphone/id840893881?mt=8

http://www.vpnbook.com/freevpn
Guía: http://www.vpnbook.com/howto/

TorVPN: (requiere regsitro)
Web: http://torvpn.com/signup.html
Guia: http://torvpn.com/howitworks.html


Varios:
Servicio Online: http://www.itshidden.eu/proxy/index.php

Saludos