Free billing and invoicing software for linux

Strictly Invoices is an application for the small business owner who wants to send out invoices!
Important Note: You may need to make the file executable by changing the properties or running the command:
chmod 755 invoices
Main features:
- Save multiple companies
- Create HTML invoice
- Save Customer Data
- Create Product List
- Print to PDF
- Save Invoices
- Email
- Change any title on the invoice to your needs (Registered Version)

Simple Invoices is a clean, simple, and basic Web-based invoicing system.

Simple Invoices is meant for personal invoices, home office invoicing, small organization invoicing, and basic POS (point of sale) systems for light usage.

Its goals are to be easy to use, simple and clean, and focused on its task. It is not meant for heavy-use POS applications, nor is it meant to be enterprise ready.

MiniBill is recurring billing software to hopefully create a contender for some of the "Modern Billing" software that is out there.
The goal is to keep it pluggable, small, and affordable. MiniBill can be used as a fulfilment and inventory to a shopping cart system, or for a Web hosting billing solution.
Main features:
- Written in PHP
- Fully Templated Using Smarty Templates
- GPL and Open Source Billing Software
- MySQL Support
- Win32 or Linux
- Billing for web hosting, ISPs, "virtual" stores
- Easy Plugin Support, with many plugins on the way
- Invoice via email
- Anniversary Recurring Billing (via cron)
- Billing gateway through Authorize.Net
- Soon to have paypal IPN Module
- Pre-Billing and Invoicing
- Custom invoice look/feel per order template category
- User Purchase Register
- Unlimited Products/services and Categories
- Simple Inventory Support
- And More!

AstBill is not only a web-based, user friendly billing interface for Asterisk and VOIP. The project is also a Asterisk configuration and GUI management tool and a standardized implementation of Asterisk using REALTIME and static configuration as you please.
AstBill is open source software licensed under the GPL, and is maintained and developed by a community of users and developers. AstBill is free to download and use. If you like what AstBill can do for you, please work with us to expand and refine AstBill to suit your needs.
User-friendly End User Web interface gives access to a range of functionality:
- Personal Contact Directory with Categories
- View SIP, IAX and Virtual Accounts
- Virtual Accounts You can forward your calls to any extension you want
- Time based forwarding and Billing for Asterisk and VOIP
- Credit Control on outgoing calls
- Show Balance, Expenditure, Payments and number of Calls on each account
- Set warning balance for email when low credit on account
- View Numbers Dialed and add them to the Contact Directory
- View Numbers Dialed by Names from the Contact Directory
- Dynamic International Rate Table (Each customer can have his own price list using Brands)
- Rate Table in Currency of choice
- Call Data Records including cost of each call and time based billing
- Call Data Records in his Currency of choice
- Switchboard (Displays live status of users phones and ongoing calls)
- Allows one click calling from GUI and direct to phone
- Call Parking sends calls to parking and then redirects to phone
- Allows transfers of calls
- Edit your Account setup
- Asterisk Billing and Management
- Edit voicemail setup including email and pin
- Create Time Based Dialing and billing. You to forward your calls based on time and day.
- Each user can have unlimited of SIP, IAX and Virtual Accounts
- Each user can have unlimited Prepaid Card Accounts linked to his userid
- Specify your hardware and change the viewable name of your accounts
- Temporary disable SIP, IAX or Virtual Account
- Manage your Incoming Public Numbers including Time based forwarding
User-friendly Administrator Web interface gives access to a range of functionality:
- Show Balance, Expenditure, Payments and number of Calls on each account
- Call Data Records including cost and Sales on each call
- Branding Module. Allows you to create Brands in any Currency
- For each Brand define Currency, Billing Increment, mark-up and connection charges
- Flexible Dynamic International Rate Table for Each Brand in any Currency
- Server Status (Displays live status of users phones and ongoing calls)
- Show Peers. List of the last clients(SIP and IAX2) that have connected to the Asterisk server.
- Audit Trail. Show IP, Port and UserAgent for each call
- Manage your Incoming Public Numbers including Time based forwarding
- Manage Trunks. You can use unlimited ZAP, IAX and SIP trunks.
- Time Based Trunk Dialing. Each trunk can have his own time based dialplan
- Temporary disable trunks
- Trunks can be rated after cost. Allow for cost based Dialing
- Define maximum concurrent outgoing calls on each trunk
- If lowest cost trunk is fully used (busy) the system will choose the next available trunk.
- Define unlimited outgoing routes and link them to your trunks
- Store cost of your outgoing route for each trunk for efficient cost control
- All outgoing routes are stored independent on the client price list
- Define customer price lists for each Brand and Currency
- Billing Routing and Management software for Asterisk and VOIP
- Advanced customer management and portal management
- Integrated E-commerce module and web shop is available under GPL
- Define list of VOIP hardware commonly used
- Full Hardware Inventory. Store mac address and serial numbers of client hardware
- View and Store Customers payments
- Asterisk Billing and Management
- Manage Pre Paid and Post Paid customers. Full Credit control by User Account
- View important Server logs from web interface
- Define maximum concurrent calls on each Customer Account

Bika LIMS project has been deployed with roles and workflows tailored for laboratories.
Bika is a LIMS, short for Laboratory Information Management System. It is developed using Archetypes and is deployed with roles and workflows tailored for laboratories.
Bika uses the mature toolset provided by Plone, to build a powerful and flexible web-based laboratory information management system.
Main features:
- Deliver Analysis results to clients and research staff immediately upon Verification. Via the web - e-mail - SMS - fax - print
- Custom lab workflow
- Accreditation friendly - Audit logs and security measures
- Automated data-capturing
- Invoicing and exports to financial software
- Authorisation profiles for technicians, data clerks and managers and clients
- On-line sample tracking
Enhancements:
- bika - version LIMS 1.2.2
- ATExtensions - version 0.7.1
- ATSchemaEditorNG - version 0.4.2
- PloneHelpCenter - version 0.9-Modified_by_Upfront
- Portal Transport - version 1.1
- stripogram
- Upfront Contacts - version 0.4

Wiaflos Accounting project is an attempt to create a multi-platform server-client based accounting system.
The goal is to have a central accounting engine which can either run on a dedicated server or on the same PC as the client interface. The accounting engine will provide a full SOAP API for easy writing of GUI/Web interfaces or tieing into inhouse systems. Seeing as the accounting engine is written in Perl and makes use of a database abstraction layer, the engine should run on nearly any operating system and use nearly any database system supported by Perl and the target OS.
We want this package to be of equal use to the one-man-show as a full accounting package running on a single PC aswell as to large multi-national corporate entities with dedicated accounting servers using the package as a fast stable accounting function, solution or full package.
Main features:
Platform independant
- Wiaflos Accountings core and engine is written in Perl. Perl is an interpreted programming language capable of running on many different platforms including Unix/Linux, Mac, Windows, BSD and many more.
Database independent
- Wiaflos Accountings database interface utilizes the Perl DBI module. This module allows Wiaflos Accounting to access multiple database types transparently, allowing you to utilize the database of your choice, be it MySQL, MSSQL, Oracle, Informix, Sybase or ODBC (or basically anything else).
Folding database transactions
- All modules use database transactions to ensure that if an error occurs everything is rolled back to a safe state. When different modules are integrated to provide functionality like invoicing and purchasing, there are sometimes quite a number of transactions involved which both update, insert and query data. The Wiaflos Accounting database engine automatically merges all transactions during a specific operation into one, this ensures a clean rollback should anything go wrong.
SOAP API (WebServices)
- The interface to Wiaflos Accounting is based on SOAP (Simple Object Access Protocol). The SOAP protocol is a critical communication protocol on the Internet due in large part to the fact that it has become native to so many development platforms, this allows Wiaflos Accounting the maximum benefit of integration and interpolation with other software packages. The SOAP API supports communication over HTTP and HTTPS and includes a full user-based access control system, allowing only certain users access to certain API functions.
Persistent sessions
- Not only does Wiaflos Accounting support SOAP, but it supports persistent SOAP sessions. Authentication is only required once, after that a session cookie is handed to the client application which can then be used in future function calls to authenticate.
Enhancements:
- This version includes support for statements and "balance brought forward" when requesting GL entries.
- Some bugfixes and feature enhancements were made.