First of all.What is a VPN?Here is all the info you need
A virtual private network ( VPN ) is a technology for using the Internet or another intermediate network to connect computers to isolated remote computer networks that would otherwise be inaccessible. A VPN provides security so that traffic sent through the VPN connection stays isolated from other computers on the intermediate network. VPNs can connect individual users to a remote network or connect multiple networks together.

For example, a user may use a VPN to connect to their work computer terminal from home and access their email, files, images,etc.

And now the list.Hope it will be useful and regularly updated.
1.Security Kiss
Features of SecurityKiss free VPN:

*. Multiple country VPN servers – in the US, UK and other countries

*. PPTP VPN, L2TP VPN and OpenVPN available

*. No ads, 100% clean

*. High anonymity – only minimum information logged

*. Easy to use client software

*. 300MB daily traffic limit for free users

2.Packetix VPN
PacketiX VPN is the technology developed by SoftEther Corporation.Features of Packetix free VPN including:

*. Server location is Japanese

*. No ads, 100% clean

*. No daily traffic limit for free users

To learn how to use Packetix VPN, you can watch the video on Youtube http://www.youtube.com/watch?v=oC0ndvwHnl8 .

3.Cyberghost VPN
CyberGhost VPN not just only anonymizes you. It encodes all data leaving your computer as well. You can look at your connection between you and the CyberGhost network as a tunnel with unbreakable solid walls, which hides all your data from spying eyes on public WLANs, Hot Spots and Internet cafés. You need to download and install CyberGhost client software. The monthly traffic limit for a free user is 1GB. No ads pops up after your computer connected to CyberGhost VPN server.

4.Shellfire VPN
ShellfireVPN Free is a free software for windows that you can download and install on your computer. It allows you to enjoy Shellfire VPN service super conveniently. ShellfireVPN 2.0 is 100% clean, which means it does not contain any form of malware, including but not limited to: spyware, viruses, trojans and backdoors. There is no data transfer limit for Shellfire VPN free users. The maximum connection speed is 384 kbit/sec for free users. No ads pops up while you are surfing the Internet through this VPN service.

5.ProXpn
For free Proxpn users:
*. Server location is in the US
*. Unlimited data transfer amount
*. Unlimited VPN connection time
*. Only OpenVPN available
*. Connection speed is limited

6.Spotflux
Spotflux is devoted to protecting your digital privacy and security anywhere and on any device. Our tiny, but powerful application not only encrypts your internet traffic, it also performs millions of cloud-based, real-time calculations to remove tracking cookies and viruses without slowing your device.It's currently free, because itls under development.They keep on adding new features too.

7.VPN Tool
Free VPN Account

protect your computer from internet attacks and intrusions.

prevents from unauthorize access your computers from internet.

filter network spam by our servers firewall system.

anonymize and secure all your Internet traffic and replace your ip address.

works with VOIP software, web browsing, e-mail, p2p, ftp, instant messaging, streaming, games etc.

secure communication when using open hotspots and unsecured internet connection where ever you are.What I like is its free.

8.Hotspot Sheild Free
*. Secure your web session, data, online shopping, and personal information online with HTTPS encryption.

*. Protect yourself from identity theft online.

*. Hide your IP address for your privacy online.

*. Access all content privately without censorship; bypass firewalls.

*. Protect yourself from snoopers at Wi-Fi hotspots, hotels, airports,corporate offices.
The free version is ad-supported and servers are less.But anyway its free.

9.Open VPN
Open VPN as the name suggests is an open source VPN based on open SSL written by James Yonan and is published under the GNU General Public License.It is free to use and provideshighest level of privacy and security and if thats what you are looking for,then look no further

10.TunnelBear
Tunnel Bear is a critically acclaimed VPN software for its its simple and intuitive UI and effective capability.Thought the free version provides only 500 MB of free usage per month you can tweet a request and get an additional 500 MB of usage,a rather tacky promotional scheme but definitely worth it.

11.Garden Networks Gtunnel
GTunnel is a Windows based proxy service developed specifically to help those locked out of the internet by their governments. Garden Networks is a not-for-profit group, working from Canada, to further the goals of internet freedom. It uses SOCKS proxy technology, and the Tor network – supplementedby its own servers, the GTunnel network. This ensures your IP address is kept hidden, while GTunnel’s encryption draws a veil over the content of your messages.

GTunnel also allows you to make GTalk or Skype calls anonymously. Whilst GTunnel is a robust and useful service – providing good reporting and feedback on network usage – it is now (except for Skype calls) only free-to-use for those with IP addresses in China and Iran.

12.Ultra Surf
If GTunnel’s recent suspension of free use has affected you, a great place to turn is Ultrasurf. This decade-old tool was also developed to help repressed internet users to get around government restrictions, and is funded in part by the US government. The core encryption algorithm has withstood the test of time, and doesn’t drag on yourinternet use – you’ll hardly notice the difference when browsing with Ultrasurf turned on.

Whilst Ultrasurf is generally considered a great tool for getting around blocks, and hiding the content of your communications from eavesdroppers, it can leave your IP exposed to tracking. For that reason, it’s best to disable any ‘active content’ features in yourbrowser, to ensure complete anonymity.

13. Gpass
For users who prefer to take their software with them on a USB flash drive, GPass offers a good solution. It’s a full-fledged proxy connection tool that lets you browse anonymously, and is completely portable. That means you can don’t have to worry about installation hassles, as it can be run it from whatever computer your USB drive is plugged into.
As with much of the free proxy software gang, GPass wraps messages in its own encryption algorithm, and then passes them out onto Tor. That keeps both you, and your browsing, invisible to prying eyes. While its servers are generally considered fast, availability can be an issue. And you can’t pick from a list of alternative country IPs, as the service runs from the US only. But neither of these niggles detract from the overall good impression that this portable proxy app makes.

14.Hotsplots
Features :

German IP

No Speed Limit

No Data Limit

SSL supported

Torrent Traffic Supported

Ad-Free

OpenVPN Based
Download Here
Credits:- ashu00

15.VPN169
This is based on open vpn and is currently in testing stages.So just visit their website and enter your email-id.They will reply with your username and password.It will be totally free.Some features are

ENCRYPTION: Prevents snooping of your internet traffic
PRIVACY: Hides your public IP address
SERVICES: OpenVPN, PPTP VPN and L2TP VPN
PLATFORMS: Windows, Linux, MAC, iPhone, iPad, Android, and More...

16.Freedom-ip
Freedom-IP is the VPN by which you may connect the secure internet anonymously, this is a French VPN and their server is located in Netherland. This VPN server offers the unique and unlimited VPN services in Free, by using Freedom-IP you can use unlimited traffic without any filter, No stored data like logs , IP andtraffic.

The Website of Freedom-IP is available in French language so it may cause a problem for those who are unaware of French language but don’t worry you have google translate to handle this issue.Also I think they ask some questions before downloading, so be careful and answer them correctly by using google.

17.VPNreactor
PNReactor is a L2TP/PPTP/OpenVPN VPN service similar to USAIP. They currently only have servers in the USA, so speeds may vary.

Most of the points that were mentioned about USAIP apply to this product too. While the free service also has unlimited bandwidth and usage, the only major difference is that the VPN connection disconnects every 30 minutes. Registration is mandatory, and they also require users to reactivate their accounts monthly. I'm not sureif they support mobile devices, but in theory they should support any devices that use PPTP or L2PT.
But trust me it's speeds are awesome, it's totally free, and highly anonymous, plus unlimited usage.This is a good vpn, apart from the disconnection thing.

18.Sumrando
Sumrando is currently in beta stages.And they promise to keep you anonymous online, or as they say, if you use us, you will be just some rando.The download is free and in the free plan you get 10gb usage.They dont keep logs, just the amount of data ised by you.That's it and you also need to register there for using.So test it guys.
19.Qlink Network
Qlink Network provides security L2TP/IPSec VPN service. They have setup four dedicated VPN servers in the United States. They install Cisco L2TP/IPSec VPN software on the servers. As a user, you need to download the Cisco L2TP/IPSec VPN client from Qlink Network. You can use Qlink Network VPN on Windows, Mac, Linux operating systems. Their official website is in Chinese.

Website URL: https://www.qlinknetwork.com

Invitation code: PiEDC7d

Website Language: Simplified Chinese
20.Mx VPN
This is another VPN service provider selling US IP VPN to Chinese Internet surfers. For free users, the monthly bandwidth is 1GB. Their client software is easy to use. When you login the client software, you will see a long list of available servers. You can accessfacebook, twitter or watch Youtube videos with Mx VPN free VPN servers. They don’t allow large file download and P2P activities.

Website URL: http://www.mxjiasu.net

Website Language: Simplified Chinese
And yeah this is not for any NETWORK TRICKS.This thread is only for users privacy and online safety