Free payments software for linux

Debt Payment Comparison Calculator project is a free, flexible tool for your Web site that does more than just calculate monthly payments.
In addition to what typical Web calculators do, which is grab the principle, interest rate, and the years to pay it off to generate your monthly payment, this calculator can tell you how long it would take you to pay off a debt if you increased or decreased the payment amount.
Each time the user uses the calculator, it saves the information so that the user can compare different payment scenarios. At any time, the user can clear the data and start over. They can also color-group different scenarios for easy visual reference.
Main features:
- Stores calculations in a session variable, so users can compare different payment scenarios, side by side without the use of a database.
- Ability to color-code the scenarios by clicking on them, making it easy to visually sort the results
- Works fine without Javascript enabled
- Simple code to work with, easy to adjust to specific needs
- Styles and scripts are already in external files, making the web page search engine ready out of the box!

Multiple Time Sheets is a simple tool to help you keep track of how many hours you work and for whom.
It differs from most time-tracking software because its designed to work like paper that magically totals up hours.
Main features:
- Uses text files, requiring no database.
- Supports only one user per app, for simpler code.
- Sends and tracks invoices, and payments thereof.
- Features a rudimentary to-do list that displays your list as an outline.
- Sends you a backup of your data automatically.
- Assume the user prefers free-form data entry in text files rather than typing into forms.
- Uses the htmlMimeMail.php class by Richard Heye (phpguru.org).
- CSV and OPML exports of some data.
- Automatic hyperlinking from MTS to your favorite web-based software.
Enhancements:
- This release added a feature that replaces text patterns with links so that strings like "Bug 10" can link to a bug tracking application.
- CSV export was added for the timesheet along with OPML export for the to-do list.

Apache OFBiz is an open source enterprise automation software project licensed under the Apache License Version 2.0.
By open source enterprise automation we mean: Open Source ERP, Open Source CRM, Open Source E-Business / E-Commerce, Open Source SCM, Open Source MRP, Open Source CMMS/EAM, and so on.
Main features:
- advanced e-commerce
- catalog management
- promotion & pricing management
- order management (sales & purchase)
- customer management (part of general party management)
- warehouse management
- fulfillment (auto stock moves, batched pick, pack & ship)
- accounting (invoice, payment & billing accounts, fixed assets)
- manufacturing management
- general work effort management (events, tasks, projects, requests, etc)
- content management (for product content, web sites, general content, blogging, forums, etc)
- and much more all in an open source package!

GNUPanel provides a Web hosting control panel for Debian.
It is specially developed to run on Debian and is a simple and easy to use administration tool to manage a hosting account. GNUPanel provides three web interfaces with SSL access at user, reseller and administrator level.
With them you can add mail addresses and FTP accounts, protect directories, redirect subdomains, etc.
Main features:
- Subdomains administration
- Parked domains
- Mail accounts and redirections
- FTP accounts
- Directories protection
- Mail lists
- Web administration for PostgreSQL and MySQL databases
- Bandwidth and disk space control
- Web statistics
- Support tickets
- English and spanish languages
- Paypal payments support
- Backup tool
Software and daemons provided:
- Apache 2
- PowerDNS
- Proftpd
- Postfix
- Courier-pop, Courier-pop-ssl
- Courier-imap, Courier-imap-ssl
- Courier-authdaemon
- Squirrelmail
- Mailman
- PHP 5
- PostgreSQL 8.1
- MySQL 5
- PHPPgadmin
- PHPMyadmin
- Webalizer statistics
Enhancements:
- This release has a better user interface, and the ability to create auto-responders has been added.
- All users can now access a mail panel that allows them to create auto-responders, redirections, and change passwords for their mail accounts.
- This mail panel can be found at http://gnupanel.domain/mail.

Zen Cart truly is the art of e-commerce; a free, user-friendly, open source shopping cart system. Zen Cart software is being developed by group of like-minded shop owners, programmers, designers, and consultants that think e-commerce could be and should be done differently.
Some "solutions" seem to be complicated programming exercises instead of responding to users needs, Zen Cart puts the merchants and shoppers requirements first. Similarly, other programs are nearly impossible to install and use without an IT degree, Zen Cart can be installed and set-up by anyone with the most basic computer skills. Others are so expensive ... not Zen Cart, its FREE!
Zen Cart will deliver the ultimate online shopping experience to your customers. Navigating through your merchandise offerings is a breeze with Zen Cart, the program provides several "Spotlight" lists in addition to the traditional category to product links. Once a product is added to the shopping cart, secure checkout is a simple 3-step process.
After providing the billing information, your customer chooses the shipping method. (multiple shipping methods including real-time internet shipping quotes are built-in) Next, a payment type is chosen from one of the popular payment modules. (PayPal and AuthorizeNet are just 2 of the included modules) Last, the customer reviews the order, shipping and payment choices, and confirms the order.
You are immediately notified of the order and your customer automatically receives an e-mail confirmation.
Zen Cart addresses many of the goals we set:
- make the program easy to set up
- make it easy to customize
- automate tasks, such as order confirmation
- make navigation simple
- built in promotions; discount coupons, gift certificates, newsletters and product notification
- offer single item specials and storewide discounts (group discounts and quantity discounts - Coming in future editions)
- built in Search Engine Optimization tools
- password protect the Administration Tool (administration "levels" - Coming in future editions)
- support multiple languages, currencies and tax structures
- In short, Zen Cart is shopping cart software the way it should have been all along.
Zen Cart gives web designers a robust and customizable electronic storefront thats easy to keep up-to-date with new features.
It provides usable, intuitive and unobtrusive purchase flows right out of the box based on proven industry best-practices - there are no major revisions required to get things right for your clients!
One of the secrets behind its power lies in our robust template system that "abstracts" the look-and-feel from the code and logic behind Zen Cart. This enables you to give clients a truly custom solution that integrates quickly and perfectly with their existing marketing websites.
Developers are able to deploy cutting edge solutions based on Zen Carts modern standards and technologies. Combining PHP server-side technology with the ability to choose from multiple databases on the back end (coming in future editions, thanks to ADOdb), results in flexible software that you can customize and modify to suit your needs. Minimum/suggested server requirements: PHP 4.1.x or higher (PHP 4.3.3+ for optimal performance), Apache 1.3.x and MySQL 3.2x.x or higher.
Enhancements:
- Two vulnerabilities related to cross site scripting (XSS) have been fixed.
- Officially certified for Paypal Express Checkout (only for North American Paypal accounts as of 20070101).
- Also includes several minor improvements and bugfixes.

Penny Pool is a small utility to ease the pooling of expenses.
It facilitates the administration of many (small) shared expenses, which typically add up to significant amounts. It uses PHP/MySQL/Apache, and has an emphasis on easy installation.
A well-known problem in groups of people is how to distribute costs of collective payments. What usually happens is that one person pays and expects the rest of the group to then pay their respective shares to him / her. This is not a problem for a single incident, but when multiple events occur, with different persons paying, it would clearly be better to pool these events.
Payments can then be set up within the group, such that the number of money transfers is minimized.
PennyPool helps in administering these kinds of expenses in the form of a simple web application. First of all, the mere fact that expenses can be entered in a central location (to which everyone has access) makes it clear to everyone who should pay what. Furthermore, it is possible to group these expenses in settlements, which can be used as a starting point for actual payments among the members of the group.
These payments can also be entered and attached to the settlement. In this way, the progress of the settlement can be seen and it is obvious how much should still be paid.
The database only stores information that was entered directly. All presented data (e.g. balance) is calculated in real-time.
Precision is therefore limited by MySQL and/or PHP, only two decimal places are shown for readability. (this also means that the cents/pennies dont always add up, in which case a "miereneuker" should use the rounded cumulative result. As opposed to harassing me...)
Enhancements:
- It is now possible to bill participants multiple times. This makes it easy to use PennyPool even when some participants to an event are not registered users.

ViArt Shop is a Customizable Ecommerce PHP shopping cart software coming with Shopping Portal Extension, multiple layouts support and with advanced set of Sales Mechanisms (Products reviews and ratings, Discounts mechanism, Shipping and Stock mechanisms, etc), Web-based Administration with Order Maintenance, Product Maintenance, User/Shopper Maintenance, Vendor Maintenance, multiple payment processing capabilities (including support of Verisign, Authorize.net, Worldpay payment systems and more).
This ecommerce solution supports MySQL and PostgreSQL databases as well as ODBC connected databases.
Package includes additional applications: Events, News, FAQ, Support Heldesk System and Forum. The set of these applications and the highly-customizable Shopping Portal Extension allows creating complex Shopping Portal in no time!
Main features:
- No need for programming at all!
- Two-steps installation routine.
- Buy two integrated applications by the price of one: PHP Shopping Cart and Shopping Portal.
- Template-based system
- Multilingual interface
- Coupons
- Enterprise version comes with two more bonus applications: Support Helpdesk System and Forum integrated within one powerful Shopping Portal.

Debt Payoff Calculator is a simple set of PHP (5) scripts that will allow users of a web site to enter their monthly income, monthly budget, and outstanding debts.
The system can then generate a debt payoff report predicting how long it will take to pay off the debts.
The algorithm is:
1. Get total monthly income.
2. Get total monthly expenses.
3. Amount available for debt service is income - expenses;
4. Compute the "kicker" as %20 of Available, reduce available by this amount.
5. Compute the ratio of each debt to total debts.
6. Multiply Available by each ratio to get the potential payment.
7. For the smallest debt, add the kicker.
8. Test if any debts would be paid off
8a. If a debt could be paid off, make the payment, adjust the last debt pointer.
8b. Add any excess funds to the other potentials, using ratio2 which excludes the debt to be paid off.
8b. Repeat 8.
9. Make the remaining payments for debts not paid off.
Repeat 5-9 until all debts paid off.
Print the table of payments.
Enhancements:
- This release has been tested with Internet Explorer and Mozilla as clients.