Sendn is presenting 10+ well-designed free newsletter templates which you can find handy for using them in your own web apps, e-mail marketing processes..
Several different types of templates exist like 1/2 columns or with/without menus.

Templates come with .zip files with the image & HTML files.
They are free to be used in both personal & commercial projects.
CakeMail is presenting 15+ free newsletter templates which are suitable for simple-to-advanced deliveries.
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Downloads include 1 column & 2 column templates.
Besides using them, it is nice to see how a newsletter must be from a company specialized in this area with the unsubscribe links, ability to view a web-version and the presentation.
Requirements: No Requirements
Sending newsletters to 1000’s of users, tracking clicks, unsubscribe links, risk of sending e-mails twice? Yes, these are some concerns of newsletter management.
phplist, an open source PHP – MySQL based newsletter management application makes sending newsletters easy, professional and managable.

Some powerful features of phplist:
- No duplicate messages. No ‘forgotten’ messages.
- View and click tracking
- Templating and multiple subscribe pages
- Dynamic subscriber columns
- User specific content like "name, e-mail"
- Lists
- RSS subscription
- Scheduling
- CVS import and export
- Bounce detection and cleaning
- Auto PDF messages
- Attachments
- Throttling to prevent server overload
This open source newsletter manager can also be integrated with the current subscriber base with the built-in import feature or some coding for syncronazing databases.
Requirements: PHP 4.3+, MySQL 4+
With the increasing number of online web services, if you want to create an online zip and e-mail servive, Online Zip offers it for free.

Online Zip is a php script which allows users add files to a zip archive and send the archive to an e-mail address.
Requirements: No Requirements
Probably, most of us upload photos to flickr via e-mail or once used Craigslist & auto-generated temporary e-mails of it for the listings.
If you want to build a similar e-mail to http process, there is a web service named Email2HTTP, which turns incoming email into easy-to-handle HTTP POST requests.

How does it work?
Email2HTTP works by acting as the mail server for your domain. When email arrives that matches one of your filters, it is posted to your chosen URL as if it were coming from a form on a web page. The attachments are sent as if they are file uploads on that form.
Who is it for?
Email2HTTP is for web developers who need to accept email in their web applications, but do not want to maintain their own mail servers & software.
P.S. Email2HTTP is now in the beta phase & totally free. In the future, besides the paid plans, a free plan will also be provided.
Getting your email to look great in all the major email clients can be a challenge at times, so, Campaign Monitor done the hard work for you with these 30 free e-mail templates.
They’ve tested them in all the major email clients, so add your own content and you’re all set.

Requirements: No Requirements