Free social bookmarking site software for linux

Bookmark4U is a server-based bookmark management PHP scripts using MySQL. Bookmark4U provides you a comfortable bookmarking environment. With Bookmark4U, you can access to your favorite web sites everywhere just by a click. You will not remember URLs of them any more.
Main features:
- The bookmark data are stored in a database in the server.
- Each user can search their bookmark database very easily.
- Bookmarks can be arranged in folders in any depth.
- For each bookmark, visit information is managed such as the visit counter or the last visit time, etc.
- Import from or export to the local browser bookmark (Netscape, Explorer, and Opera).
- Support multilingual users.
- Users can set their own preference.
- You can access to your firends bookmark tree.
- Clipboard, Trashcan, History Layer, Calendar, and more.

SynapseLife Toolbar Extension provides easy access to SynapseLife.
SynapseLife is a collection of 9 integrated web applications including tools for organizing your life including social bookmarking, rss feed aggregation, tagging, contacts, calendars, to-do lists, and a money ledgers.
Main features:
- Add favorites and feeds easily from the toolbar
- Livesearch of all of your items within SynapseLife
- Overlay of contextual icons and buttons on existing social networking sites for easy addition of contacts, calendar events, feeds and favorites.

NewsCloud Facebook application allows Facebook members to read top stories and breaking news and share them with their friends from within Facebook.
The NewsCloud Facebook application also allows you to watch Daily Show and Colbert Report clips inside Facebook and share them with other Facebook members. Facebook is a social network with a new API for applications. NewsCloud is an open source collaborative social news network.
As the documentation to Facebooks API is still incomplete, the source code to the NewsCloud Facebook application may be instructive to other Facebook developers.
Enhancements:
- Added support for multi-friend selector with thumbnail images
- Added SQL table structures

Boingle is a Firefox extension with the role of a social annotation. With the Boingle toolbar for Firefox, you can add your own comments to any web page.

The result is a simple, unassuming link left in each page that allows other Boinglers the opportunity to read your comments and add their own. Have fun...voice your opinion...Boingle!

Stock Quote is a Firefox extension that allows you to get stock quote of selected ticker from any financial site that you define in the setting page.

Hierarchical Grid Site Managment is a front-end to the database that keeps information about the grid sites (clusters), their admins, email and phone contacts, other contact people, site nodes and resources, downtimes etc.
These sites are organized by country and countries are organized by regions. The admins of each site can also update the information about the site.
To summarize the design, the applications supports only one GOC (Grid Operation Center), assuming that it is used for only one grid. It can have several ROCs (Regional Operation Centers), each ROC can have several countries, and each country can have several sites.
Each ROC, country and site can have one (or more) admins, which are able to modify the data of the structure (record) which they admin (ROC, country or site), and to manage substructures as well.
Managing substructures means that they can also validate/appoint the admins of the substructures, e.g. a country admin can validate/appoint the site admins. The admins are recognized automatically by their certificate (without the need to use passwords).
For each structure (ROC, country, site), contact info about it are stored, including email and phone. For the sites, general info about it are stored, contact info, info about its resources and capacities, site contacts, site downtimes, and info about its nodes. For more details see the DB design: hgsm_design.sql.
In the pages where a user has edit rights (in the node where he is admin and in all the subnodes), an Edit button is displayed. Clicking in this button, the page will be displayed in the edit mode, where the fields of information can be modified, the rows of the lists can be edited or deleted, new rows can be added in the lists, etc. The id and the admins of a node can be modified only by an admin of the parent node.
Main features:
- Has a database with information about a hierarchical structure (GOC-->ROCs-->Countries-->Sites-->Nodes).
- This information is published to the www by a web application.
- Each node of the tree has also one or more admins, which can modify the data of the node which they admin, and also the data of the subnodes.
- The admins of a node can appoint (set/modify/delete) the admins of the subnodes and leave up to them the modification/update of the subnode information (to make their job easier and for decentralization).
- Authentication (recognizing that somebody is admin of a node and has the rights to modify it) is done automatically by the application, using personal certificates, which are issued and verified by a certain certification authority. This means that everybody that is an admin, must have a valid certificate installed in his browser.
- The application also supports i18n and l10n (is multilingual, can be translated into several languages).
Enhancements:
- This release includes full internationalization and localization support for Albanian and Croatian.
- It also contains bdii.php?type1+type2+type3 and ldap2mysql.py the scripts.
- Some small improvements and bugfixes were made.

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