Billing / Invoicing applications for GNUmed

There is the ongoing quest to use GNUmed for billing. GNUmed is primarly used for documenting patient's healths or disease but a medical office is a small to medium business as well.

SimpleInvoices:
webbased, PostgreSQL (beta)
no interface we know of,
GPL,
no Debian package,
project active
i18n capable

Amberdms billing system:
webbased, PHP, MySQL
SOAP API,
AGPL,
no Debian package,
RPM package avaialble,
project active - run by webhosting company
i18n capable
press coverage

jBilling:
webbased, MySQL, PostgreSQL, Oracle
API,
AGPL,
no Debian package,
project active - run by a company
i18n capable ?

citrusbd:
webbased, MySQL, PostgreSQL ?
no interface we know of,
GPL,
no Debian package,
project active
i18n
capable

GNUcash:
fat client, written in C, PostgreSQL , yeah
no API, however python-gnucash
GPL,
Debian package,
project active
i18n capable
does online banking

not yet considered:
openbill - pre alpha,