Squirrel

The Squirrel Webmail is a standard-based e-mail application which is written in PHP. It’s a free application to use. Squirrel mail includes everything, from the message list to the address book which is designed so professionally that you can navigate them easily.
If you need to personalize your mail account Squirrel have such facility too. You can even have custom theme for your webmail program thus you can adjust look and feel of your webmail program as you want. There are many plugins available which can be integrated with your Squirrel webmail program. Eg.. you can have using calendar, xtending functionality of your address book, can add filters for handling spasm etc…

Horde

Horde is also one of popular webmail program which is widely used.
Using Horde you can easily compose emails and handle all incoming messages. You have excellent address book feature structuring your contacts. If you want you can save incomplete emails as draft which can be accessed later. You can  consider Horde as something similar to Outlook Express.
Major difference between them is that with Horde you can access all your emails wherever you are you just need to have Internet connection for accessing them.

RoundCube

RoundCube is also one of best webmail application which you will get as a free Webmail software . It provides you a great inbox options, such as drag and & drop, privacy protection, integrated address book and HTML and multipart support are important aspect which are included with this application.
RoundCube offers you an excellent customer support if you got stuck or had any problem with your emails.

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