LiteAccounting – Invoice and track payment from your customers without a bunch of extra, useless features.

Invoice Journal – Free invoicing program.

endeve – Issue invoices, manage clients and check revenues all in one place.

ContractPal – Take your contracts and forms paperless and have them completed, validated, signed and processed online.

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270+ Tools for Running a Business Online

There are two things in this rule:

* For static components: implement “Never expire” policy by setting far future Expires header
* For dynamic components: use an appropriate Cache-Control header to help the browser with conditional requests

Web page designs are getting richer and richer, which means more scripts, stylesheets, images, and Flash in the page. A first-time visitor to your page may have to make several HTTP requests, but by using the Expires header you make those components cacheable. This avoids unnecessary HTTP requests on subsequent page views. Expires headers are most often used with images, but they should be used on all components including scripts, stylesheets, and Flash components.
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Add an Expires or a Cache-Control Header

80% of the end-user response time is spent on the front-end. Most of this time is tied up in downloading all the components in the page: images, stylesheets, scripts, Flash, etc. Reducing the number of components in turn reduces the number of HTTP requests required to render the page. This is the key to faster pages.
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Minimize HTTP Requests