Surreal Todo is an open source web application that can be used as an online notebook or a to-do-list manager.

It is built with PHP, uses MySQL for storing data and relies on jQuery for the JavaScript part.

With a totally Ajaxed interface, you can create new lists, style every item or mark them as completed.

The application enables you to create new tabs and pages instantly for a better organization of the lists/content.

Also, list items can be re-ordered or moved to other lists via drag'n drops and lists can be collapsed to save space.

TeamLab is a collaboration platform that is built with enterprises in mind but fits to any small-to-bigger teams too.

The platform enables users to create teams, manage projects with setting milestones and creating tasks which can be assigned per user.

It comes as 2 versions:

• hosted (and free)
• open source, to download on your infrastructure (and free)

By simply scheduling tasks and with the help of e-mail notifications, it is hard to miss a deadline and you always stay informed about the overall of a project.

Using a built-in IM, it is possible to communicate each other. Also, integrated blogging, forum and wiki capabilities makes sharing of information very easy.

TeamLab can also help the members of a team to keep up with the support for managing events, news, polls, photos and bookmarks.

ArgentumInvoice is an open source web application for managing projects easily and billing the time worked accordingly.

It enables you to define clients, create projects and add tickets (things to be done) for that project.

The time worked for a ticket can be calculated with the help of a live timer or mentioned manually. Also, it is possible to create timesheets for every user.

At any point of the projects, ArgentumInvoice can create PDF invoices, e-mail them to clients and track invoice due dates + payment statuses.

It also supports multiple currencies and automatic currency conversions which is nice when working with multi-national clients.

The application is built with PHP & uses MySQL as the database.

PlanCake is an open source task and list manager which can be downloaded/installed to a custom location or used from plancake.com for free.

The application is fully Ajaxed, tasks can be re-ordered with drag'n drops and keyboard shortcuts are supported which all make the usage faster.

It is possible to create tasks with due dates (or not) and PlanCake can display your to-do-list inside a calendar. Or, you can reach them from the lists they are bound to and the tags they were marked with.

The application can be used in 2 modes:

• basic: to create lists with tasks for your projects or other stuff
• advanced: to implement the popular GTD method of David Allen.

If you prefer to print a list and check them offline, PlanCake can instantly generate a printer-friendly version.

The application is built with PHP (Symfony) and uses MySQL to store data.

todoyu is an open source task/project management, time tracking & collaboration application that is built with PHP.

The application has a modern, Ajaxed interface where both users & clients can have roles on projects.

Using todoyu, projects can be divided into multiple milestones with sub-tasks that are assigned to users.

The time worked on every task is recorded which can be used in future analysis or billing purposes.

Optionally, todoyu can auto-generate invoices after completion of a project & export them as PDFs.

The application also has a built-in calendar for managing appointments.

Teambox is an open source platform that enables teams to collaborate on projects with a Twitter-like interface.

The application is built with Ruby on Rails and, besides the open source version, has a hosted version too.

Users can create an unlimited number of projects & tasks, assign them to their colleagues, share messages, files & much more.

Users can start a conversation instantly, create pages to store information & Teambox can integrate clients to the system to colaborate with them easily.

The application is multilingual, has support for mobile phones & offers a read-only API for integrations with 3rd party softwares.

qdPM is an open source project management application that is created for small teams in mind.

It is built with PHP/MySQL & relies on Symfony Framework (bundled with the download package).

It has support for adding extra fields for projects, tasks & users which eases customizing the application.

With the multiple task editing feature, it is possible to work with multiple tasks faster.

Projects in qdPM can be set to different billing types like per hour, fixed price, etc. & a powerful reports module helps analyzing these data like any other data in the system.

The application is multilangual & already comes with various language files.

Retrospectiva is an open source project management & bug-tracking application that is focused on development teams.

It is built with Ruby on Rails & requires a MySQL database for storing the data.

It has 3 main modules:

• ticketing: to manage issues/requests
• code review / revision management: supports Subversion & Git)
• milestones / goals: to set & manage objectives for the project

And, comes with various add-ons like:

• wiki: manage documentation
• blog: to interact with the community, make announcements.
• agilePM: comprehensive support for your agile development process
• & more, which can be found in the wiki's installation pages.

Retrospectiva has an easy-to-use admin interface, a XML-REST-based API for integration with 3rd party applications & RSS support for following every content much simpler.

Paymo, a multilanguage & web-based time-tracking / invoicing application is giving away "20 Lifetime Invoice Accounts" (normally $9.99/month) to WebResourcesDepot users. Before any more details on that:

What is Paymo?

Paymo is a very functional application for anyone (whether you're a "one-man-army" or a "team that works on same/different projects") for tracking the time that is worked on projects>tasks, analyze that time & bill your clients accordingly.

How does it work?

Users:

First thing to do is creating users (the application is totally free for up to 3 users). Considering every user may have different conditions, it is possible to set variables like workday length, timezone, week start day, etc for every user.

Clients:

It is necessary to define clients (this can be yourself for your own projects) in order to create the projects. This info is also used in the invoices.

Projects > Tasks:

That's the heart of the application, yet very simple to define & use.

Projects can be created by defining the details like: the client, budget hours, price per hour & users that will work in the project. After that, tasks can be created which are the main things that the application tracks the time of.

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Normally, we cannot schedule everything we’re going to do & at the end of the day we end up asking: "where did my time go?".

LogMyTask is a web-based time tracking application which is totally focused to finding that out with no extras that makes it easier to adapt & use.

It can be used by only one user or collaboratively with a group of users & even different teams.

The usage of the application is very straightforward:

• admin user creates teams
• invites users to the teams by simply providing their e-mails
• users can start creating their tasks

The application works in almost real-time with very few refreshes. When a user adds/updates a task, the other users instantly see them.

With just a click, it is possible to see "what, when & how long every user worked on" in a calendar view. And, if needed, edit the past data.

Conclusion:

The application is so easy to use (like the Twitter for time tracking) & very functional for individuals to teams who want to get the most out of their time.

LogMyTask is currently in beta status & totally free to use. After the beta, there will still be a free plan offered.

P.S. This post is a sponsored review.