Free groupware wiki software for linux

POGI is the PHP OpenGroupware Interface. It allows PHP enabled websites to be easily integrated with the powerful OpenGroupware groupware server. Current versions of POGI work with PHP version 4 and 5.

pHEAR WiKI provides a small wiki for a personal Website.
Features include easy editing and creating of pages, the ability to assign keywords that are highlighted in other wiki pages, URL archiving, and a full range of administration abilities.
Main features:
- Administration abilities:
- easy backup and restore of Wiki data files
- database compacting
- page deletion
- page version control (restore old versions of pages),
- Easy to edit and create new pages (thats what its all about afterall)
- Keyword highlighting: assign keywords to a page that are highlighted in other pages
- Simple keyword searching
- URL Archiving
- Embedable commands for enhanced Wikiing
- Easy template system to fit wiki into your site
Enhancements:
- Added a check for conflicting page saves. A conflict occurs when two user are updating the same page at the same time. A merge is automatically performed in this case.
- Did a security audit of the code. Probably a necessary thing if I plan to give this out and expect people to use it. Should be okay now. If you haver version 01 I can think of another reason to call it phear wiki.
- Added check for wether or not a title was entered. If no title was entered then a default title is used.
- Changed the way saved entries are sent to the server
- this allows pages of virtually unlimited size to be edited and mantained.

Simple Groupware is a complete groupware package written in PHP, XML, SQL, HTML, CSS and sgsML.
Unlike other groupware software, Simple Groupware contains the new programming language sgsML. It enables the quick creation of powerful web applications.
Simple Groupware is Free Software, released under the GNU GPLv2 License.
Main features:
- A 100% web-based application (no special client applications or plugins required). Optional a client for Windows is available to make downloads/uploads easier
- Complete secure communication using SSL
- Easy and intuitive user interface
- One platform for managing, controlling and developing business processes
- Autonomy: Simple Groupware is fully driven with open technologies
- Individuality: All hierarchical organization structures and responsibilities can be represented and managed in the application
- Intelligent knowledge management: e.g. find everything faster using phonetic search algorithms and automatic file / content indexing
- Notifications: get notified when data changes by using RSS feeds
- Unicode: Simple Groupware fully supports Unicode characters using UTF-8
Modules included:
- Calendar
- Contacts
- E-mails
- Tasks
- Files
- Notes
- Passwords
- Bookmarks
- Portal
- Chat
- FAQ
- News
- Forum
- Gallery
- Projects
- Statuses
- Templates
- Inventories
- Resources
- Brands
- Locations
- Distributors
- Device types
- Offices
- Positions
- Companies
- Departments
- Contact groups
- Contact activities
- Spreadsheets
- Users
- Groups
- Events
- Backups
- Rights
- Search
- Statistics
- iCalendar
- IMAP
- POP3
- SMTP
- RSS
- vCard
- LDAP contacts

Tiki CMS/Groupware (aka TikiWiki) is a powerful open-source Content Management System (CMS) and Groupware that can be used to create all sorts of Web applications, intranets, portals, sites, and extranets.
Major features include articles, forums, newsletters, blogs, a file/image gallery, a Wiki, drawing, trackers, a directory, polls/surveys and quizzes, a FAQ, chat, a banner management system, Webmail, a calendar, Ephemerides, maps, charts, Mobile Tiki (PDA and WAP access), RSS feeds, a category system, a theme control center, workflow, live support, Shoutbox, ACLs, and more.
Main features:
- The Wiki
- Image Gallery
- Articles and submissions
- Blogs
- JgraphPad drawings
- Mobile Tiki
- Voice Tiki
- Banner ads
- Dynamic Content System
- File Galleries
- Featured Links
- Comments
- Forums
- ChatRooms
- Communications center
- Polls
- Category system
- FAQs
- Quizzes
- RSS feeds
- HTML pages
- HTML pages dynamic
- Surveys
- Trackers
- Maps
- Newsletters
- Directory
- Ephemerides
- Shoutbox
- Search
- Games
- Live Support System
- Galaxia Workflow Engine
- Charts
- My Tiki section
Enhancements:
- This release contains fixes for some security issues, many bugfixes, enhancements, and new features.

NullLogic Groupware is a multi-user web-based groupware package designed for contact management and event scheduling, which includes additional features such as instant messaging, public forums, shared hyperlinks, file bases, a web e-mail client, and a simple order processing system.
The main goal of NullLogic Groupware is to make your data accessible to you from anywhere at any time without the need for special software to be installed on the client computer. All you need is a web browser.
Additional features include private messaging, public discussion forums, webmail, shared bookmarks, file sharing, call tracking, order processing, an XML-RPC API, and integrated POP3 and SMTP servers.
Enhancements:
- fixed zero domain ownership on newly created mail filters
- added ClamAV support to sample scanner script
- cleaned up some of the page transitions in mod_mail
- SQL subsystem was rewritten to handle an arbitrary number of cached queries

Rhizome is a Wiki-like content management and delivery system that exposes the entire site -- content, structure, and metadata as editable RDF. This means that instead of just creating a site with URLs that correspond to a page of HTML, with Rhizome you can create URLs that represent just about anything, such as:
- structural components of content (such as a bullet point or a definition).
- abstract entities that can be presented in different ways depending on the context.
- relationships between entities or content, such as annotations or categories.
Rhizome is designed to enable non-technical users to create these representations in an easy, ad-hoc manner. To this end, it includes a text formatting language which similar to a Wikis but lets you author arbitrary XML content and RDF metadata. And for developers, this allows both content and structure to be easily repurposed and complex web applications rapidly developed.
The long-term vision is that each Rhizome site will intertwine together, forming an emergent fuzzy taxonomy over a peer-to-peer network.
The nearer-term goals of Rhizome are:
- To allow (relatively) non-technical folk to create "Semantic web"-enabled web sites.
- To provide a platform for the rapid-development of web applications
- To provide a test-bed for experimenting with new forms of collaborative knowledge production and communication
- A showcase and test-bed for its underlying technologies: Rx4RDF, ZML, and Raccoon
Main features:
Wiki ease
- All the functionality of a Wiki: public and automatic creation of pages and links using simple text formatting rules
- But the same formatting rules can used to author arbitrary HTML, XML and RDF
- And you can create and edit not just content but also the metadata, site structure and appearance, even application behavior
- Including dynamic pages: supports XSLT, RxSLT, Python, RxUpdate
- Thus enabling dynamic, rule and context based presentation of content
Advanced Content Management functionality
- pages can consist of any content: xml, html, binary, etc.
- content, metadata and site structure is a stored as RDF: enabling it be repurposable, human editable, application agnostic, etc.
- flexible authorization and security model
- staging/release workflow
- native versioning of content and metadata, conflict detection
- supports local file system or browser-based development
- can generate static websites
- import/export of content and metadata
- flexible backend: supports multiple RDF engines (Redland, 4Suite, RDFLib) with multiple datastores: file based, SQL databases, embeddable databases (Sleepycat, Metakit)
XHTML or arbitrary XML can be authored in ZML in a manner very similar to Wiki text formatting rules. Rhizome comes with built-in support for Apache Forrest document types and has preliminary support for DocBook. You can also easily view and edit RDF metadata for the site using RxML.
Almost all of Rhizomes functionality can be found its dynamic pages, which are written in RxSLT, XSLT, and RxUpdate. These can be edited like any other page, making it easy to add and change functionality without restarting the server. You can use RxUpdate to migrate the underlying schema at run-time. Rhizome supports fine-grained authorization and versioning of both metadata and content, so you have some guard rails too.
Enhancements:
- This release adds "shredding": a framework (including GRDDL support) for extracting RDF from content and maintaining the relationship between them over time.
- It also includes better support for viewing and editing RDF directly with most RDF formats.
- There are also several UI enhancements, including a new UI for managing users and roles, more Wiki features, and page and comment spam detection via the Akismet service.
- Last but not least, it is several times faster than previous releases.

Wikepage is a 25kb small wiki/personal site builder.

Wikepage Wiki project has i18n support, multi-language site support, password protected pages, table support, CSS styling, file upload, and a lot of other features.