Free user accounts software for linux

PHP Accounts project is an open source web based accounts system.
Main features:
- Generation of pdf invoices, receipts, quotes
- Email invoice (pdf attachment) to clients
- Automated invoice reminders (sent via email)
- Timesheet system - great for consultants charging on an hourly basis
- Invoice wizard for quickly creating a fully itemised invoice
- Expenditure/Outgoings
- Cash flow reports
- Spreadsheet export

Useful Traffic Accounting Dragon is a traffic accounter that actually gives useful information about traffic instead of stupidly counting incoming/outgoing packets.
Dragon accounts traffic by user, program and timestamp and puts this information into useful correlation.
Dragon is implemented as a Perl script for the backend, using /etc/passwd to automatically get information about user accounts, /proc/net/ to get information about open connections and /proc/ to get information about running processes and which processes currently use which network connection.
All this information can be combined so you can actually see what user caused which traffic using what program and when it happened.
All this information is acquired automatically so the minimal configuration necessary is to tell dragon where it can find its MySQL database.
Enhancements:
Features:
- cleanup on CTRL-C
- add patch for Linux Kernel 2.6.17.7
- for now, graphs are disabled in the webfrontend
- webfrontend has now Total, User and Program tabs
Bugfixes:
- forgot to close a filedescriptor fixed
- use leading zeroes on port numbers in messages about connections that no longer exist
- really fix wait for next minute

XUP is an attempt to replace static per-site user accounts, which most present dynamic web sites use in absence of an easy to use and open/shared user account system. It allows people to use a single account or profile with many sites, or one of their existing user profiles on multiple other web sites.

It is best suited to so called "community" sites, where the account serves mainly for lax identification of people among each other. It does not stipulate strong authentication (while OpenID or LID can be used) and is therefore only useful for applications with mediocre security and privacy demands.

Chat and discussion sites are the main target, but profiles in different applications can often also be enriched with them. They are meant to get used secondarily (as alternative) to static/local user accounts.

The XML format of user profiles is extremely simple, as is the associated login service API. Both are outlined and explained in the introduction (HTML). The format is basically an XMLified vCard with a few additions targetted at online/web communities. It is easy to parse and generate and therefore also suitable for profile exchange or import.

Theres also a more authoritative RFC-style text version of the current proposal, which provides further hints and explanations for implementors. Future extensions will get listed in the project Wiki however (field names in the XUP format are not regulated).

This effort is quite new, and therefore only very few actual (real-world) implementations are known so far.

Some software, like discussion boards (which mostly suffer from spaghetti code), are of course hard to extent with XML User Profiles. Even those that abstract their internal user database and UI logic reasonably well can often be difficult to adapt. It is however expected that the more professional systems will sooner than later be XUP compatible.

Deadlock is a powerful, customizable, fully featured user management system which protects Web directories and documents using Apaches htaccess and htpasswd.
It features email verification and administrator approval capabilities that require the administrator to approve accounts before they become active. Deadlock supports both Basic and Digest authentication.
Main features:
- Administration Panel
- All settings and administrative controls are in the admin panel.
- User Panel
- Gives users the ability to change their password, email address, and any other account information
- Admin Approval
- When this option is enabled, the administrator must approve accounts before they are able to login to the protected area.
- User Email Verification
- Users are sent a confirmation email to the address specified and must click the link in the email to verify that the email provided is their email.
- Multiple Authentication Types
- The administrator has the option to choose between Basic and Digest authentication.
- Auto htpasswd generation
- Automatically generates the .htpasswd file containing the users when a new user is added.
- Auto htaccess generation
- Automatically generates the .htaccess file when the name of the protected area is changed.
- Templatable user panel pages
- The user panel pages are generated with a template engine, allowing you to customize the pages that the user sees by simply editing the html templates.
- Templatable System Emails
- Customize system emails by editing the templates. Deadlock does not yet include an editor in the admin panel.
- Web based configuration
- Configuration options can easily be modified through the administration panel.
- Integrated Email Functionality
- Specific users can be emailed straight through the admin panel, by simply selecting a link.
- Bulk Email all registered users
- Includes bulk email functionality allowing you to email everyone in the database.
- Search through user list
- The user list is searchable, allowing you to find a users account by just entering their last name, first name or username.
- Rollover Information
Enhancements:
- [bug fix] Fixed some problems that occur when gpc magic quotes is enabled
- [bug fix] Added some string escapes to mysql queries to prevent SQL injections
- [bug fix] If user edits their own account, notification email is not sent
- [security] Fixed bug that cuased problems when a user went to edit their account

eXtended Account Management System is a PHP-based application suite made for managing electronic mail accounts on multiple domains in a virtual hosting environment.
The XAMS eMail management system primarily consists of a powerful administration panel for managing users, aliases, mailbox quotas, and other mail-related functions.
Main features:
- Manage any number of domains, mailboxes and aliases
- Multiple domains can be grouped as a "site".
- If you have, for example, two domains domain1.tld and domain2.tld within site site1
- then mails to either of the two email addresses for user user (user@domain1.tld
- or user@domain2.tld) will be delivered to one mailbox.
- Autoreply (out of office) support
- Mail accounts are independent from system accounts
- Mailboxes can have quotas, which you can manage by reseller, site or user.
- Four different user-levels: Administrators, Resellers, Customers and Users
- - each user-level and each user can have individual restrictions
- Easy to use, web based GUI (front end)
- GUI based BIND (DNS server) configuration
- Supports the Exim mail transfer agent
- Supports the Courier-IMAP mailbox server, which provides POP and IMAP access
- Supports the MailScanner virus scanner
- Supports MailScanner and SpamAssassin
- Supports any web-based mail user agent that uses POP or IMAP (Squirrelmail preferred)
- Supports following SMTP-AUTH modes: PLAIN, LOGIN and CRAM-MD5 with or without TLS
- Uses MySQL or PostgreSQL for account storage
- Uses CDB for fast domain lookups in Exim
- Source package includes PAM (Pluggable Authentication Modules) module and Squirrelmail plugins
- Provides easy to use debian packages (.deb files)
XAMS manages these domains and user accounts in a database, entirely separate from your Unix system environment.
XAMS ties together and integrates with these packages to provide a coherent virtual hosting solution for e-mail:
- Exim, a flexible mail transfer agent (MTA) with an intuitive and flexible configuration system
- The Courier IMAP/POP server for mailbox access
- MySQL, a powerful, free database server, used for storing domain and account information.
XAMS does not currently manage FTP or HTTP servers. The XAMS graphical user interface is written in PHP, runs on top of Apache, and produces XHTML 1.1 compliant pages.
Enhancements:
- Several bugs were fixed regarding Exim configuration, SQL, and more.

Secheck is a script designed for linux users to keep up with some security issues on their system. secheck runs nightly and checks on such things as: SUID files, passwordless accounts, open ports, users on the system with root access, who has sud to root, etc. For more information, please see the about page.
I have written a small install.sh script which should handle all installation. Heres basiclly what it does, minus the crontabing
1. cp secheck-* /usr/local/etc/ && cd to /usr/local/etc/secheck
2. unpack the archive with: tar -xvf secheck-0.01.tar
3. cd into /usr/local/etc/secheck/
4. chmod +x security.check secheck
5. edit secheck and change the email address to the user(s) or email address you want the output mailed to.
6. Run secheck
7. crontab secheck
When it is finished, the output should look like this:
/root/secheck-*(version number)
/root/secheck-*/secheck
/root/secheck-*/security.check
/root/secheck-*/other docs, README, INSTALL, etc
/usr/local/etc/secheck/secheck
/usr/local/etc/secheck/security.check
/root/.secheck/baslinefiles
If that isnt the case.. you may need to cp a few files here and there, and I will have it fixed in the next release.
Main features:
- 1. Show open ports on the system
- 2. Shows the current users on the system.
- 3. Shows how much drive space is free (in gb)
- 4. Shows SUID and SGID files on the system
- 5. Checks for users with root accounts
- 6. Checks for passwordless accounts
- 7. Shows system processes
- 8. Shows who has sud to root (also includes sudo)
- 9. Optional: shows denied packets through ipchains/iptables
- 11. Shows all files with no owner
- 12. Show the differences between a basline copy of: /etc/passwd, /etc/shadow, /etc/group, and /etc/inetd.conf with the current version.
- 10. Emails the output of all of these to a user specified in check.sh (the wrapper script).

PrefGenerate is a script used to configure user accounts without the need for user interaction.

PrefGenerate sets up a complete Mozilla Firefox and Mozilla Thunderbird profile, as well as the window manager Icewm. Its currently used in an enviroment with over 8000 users.

Evolution provides integrated mail, addressbook and calendaring functionality to users of the GNOME desktop.
Main features:
- No viruses or worms
- Junk filtering
- Desktop integration
- Developer Platform (EDS)
- Evolution#
- EPlugin
- Advanced email searching
- Web calendars
- vFolders
- User-defined filters
- Multiple accounts
- Palm device support
- Customized reminders
- Multiple calendar views
- iCalendar support
- To-Do list
- LDAP compatible
- Share vCards
- Security and encryption
- Open Source