AGPL web-based billing system providing accounting, service billing, time keeping and more.
PHP JavaScript CSS HTML Perl TeX
Latest commit 42be1e2 Mar 20, 2015 @jethrocarr Deprecating
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accounts * Implemented fixes for credit notes in annual reports. (issue 197) Aug 29, 2011
admin Updated optional phone home with better details and current API support Sep 21, 2013
api Enable invoices and credit note PDFs to be downloaded in API Aug 22, 2013
customers correct customer's shipping address section title Jan 15, 2014
data * Implemented large chunks of journal code Sep 19, 2008
external * Legacy wrapper script for wkhtmltopdf tricks. Aug 11, 2012
help Boosted copyright from 2013 to 2014 Jan 1, 2014
hr * Updates for PHP 5.3 and E_NOTICE fixes Jan 9, 2010
images * Bug Fix: Removed executable permission from non-executable files as… Jan 1, 2014
include Added SQL changes for release 2.0.1 Jan 1, 2014
language * Implemented new user interface for performing application translati… Oct 6, 2010
popup * translation May 3, 2010
products * Implemented new search dropdown logic throughout most of applicatio… Jun 27, 2010
projects * updated dropdowns throughout billing system to order by codes rathe… Oct 11, 2010
services * Implemented type-specific data cap override functionality (issue 319) Sep 14, 2011
support Added warning about support tickets being deprecated. Will be removed… Oct 13, 2013
templates * Bug Fix: Removed executable permission from non-executable files as… Jan 1, 2014
themes usability: set CSS mouse cursor for "ADJUST TABLE OPTIONS" clickable … Jan 15, 2014
timekeeping * missed a couple debugging lines, now removed Oct 11, 2010
user * Upgraded framework to provide filtering options (issue 302) Jun 16, 2011
vendors correct vendor's shipping address section title Jan 16, 2014
.gitignore Added ignore for config files Jun 30, 2013 Deprecating Mar 20, 2015
home.php Removed developer mailing list - inactive Dec 22, 2013
index-export.php Boosted copyright from 2013 to 2014 Jan 1, 2014
index.php Boosted copyright from 2013 to 2014 Jan 1, 2014
message.php Working on porting to new page framework Dec 3, 2008
popup.php * Improved CSS for translation popup (issue 166) Aug 19, 2010

Amberdms Billing System (ABS)

** Please Note: I consider this project deprecated, the code remains here as a reference but is not active maintained **

Project Homepage

For more information including source code, issue tracker and documentation visit the project homepage:


The Amberdms Billing System (ABS) is an open source web application providing accounting, invoicing, service management and time keeping functions that are ideally suited for small and medium businesses as well as small ISPs and IT companies.

Business software is one of the more commonly neglected areas of open source, ABS is designed to fix this issue and deliver a solid accounting and billing platform for individuals and small-medium sized businesses.

Developments of ABS has come from a background of working with telecommunications companies and technology companies and the feature set reflects this - having said that, ABS is extremely flexible and with a range of features should be a good match for any business.

ABS includes double-entry accounting, but it's also entirely possible to use it as a billing system only and keep using another accounting system (such as one more targeted to your country's requirements) for the accounting.

Key Features

  • Double-entry accounting system with tax and financial reports.
  • Powerful invoicing with support for both LaTeX and HTML/CSS templates for PDF invoices.
  • Service billing support including features designed for billing for VoIP and ISP data services, including billing for usage based on Netflow and call records.
  • Supports bundling multiple services together to suit sale's teams desires for value added packages and bundles being sold to customers.
  • Time keeping and billing functions, designed for consultancy companies to bill project time to their customers.
  • Credit note support and management of customer account balances.
  • Generating good looking quotations and turning them into invoices when accepted.
  • Powerful customer record keeping features including multiple contacts, custom notes and documents and attribute store.
  • Flexible permissions system allowing easy control over staff access permissions of all application features.
  • API for allowing easy integration with payment gateways or other systems.
  • And much, much more... check out the latest release notes

Getting Started

To get started with Amberdms Billing System, read the installation instructions on the project homepage: