BitNami Tracks Stack is an all-in-one cross-platform installer for Tracks, a Web-based application to help you implement David Allen's Getting Things Done methodology. It installs Tracks, Ruby On Rails, and everything else necessary to have a running program in minutes. It works on Windows, Linux, and OS X.
RDVz is a Web application for setting conveniences for meeting appointments between several persons. RDVz uses a poll system: each invited user votes for one of the dates suggested by the meeting organizer. The poll organizer chooses possible dates, creates the poll, and sends the poll's URL to the participants. The organizer can export poll results in a CSV file. Anonymous access, MySQL, LDAP, and SSO (CAS) authentication methods are available.
TKDO is a master TODO list with command line and PyGTK interfaces. It takes all your VimOutliner todo.otl outlines, merges them into a single flat list, auto-sorts them, filters them, and adds support for things like contexts and recurring events. It also has a snooze button, to mark tasks as "don't bug me about this for a while". The entire system is based on plain text files, with a GUI to make certain tasks easier and faster. Due to its plain text nature, it's easy to extend or customize the system with short scripts.
NoteFinder is an application for managing any text information: notes, quotes, conversations, drafts, articles, contacts, etc. It features creating, viewing, editing, renaming, deleting entries, rich text formatting, inline calculations (e.g., use ~7+8~ to get 15, or functions and constants from Python's math module, such as sqrt, sin, and pi), organizing entries chronologically (creation dates) and semantically (tags), advanced search (with date:, tag:, title:, year:, month:, and day: parameters), saving searches, multiple notebooks, multiple backends, the ability to move/copy entries from one notebook to another, synchronizing via email/Wiki, linking entries together, CamelCase links support, and a tabbed interface.
SamTodo is a simple PHP application that makes managing a todo list as easy as possible. It allows for a prioritized and categorized listing of information ensuring that you won't forget important tasks again. The source code is easy to understand and the entire program is stylized using CSS (so it can be easily adapted to your needs). It only requires access to a Web server that supports MySQL and PHP.
smupcheck, which stands for Smart Update Checker, checks Web sites for updates automatically, even if they don't offer an RSS feed. It is a very basic tool, and does not offer advanced features such as checking password-protected Web sites, highlighting changes, or filtering results.