ImpressPages is an open source CMS application where you can create and edit while browsing.

Creating new themes requires only the knowledge of HTML-CSS and with the help of a drag 'n' drop interface, texts, videos, photos (or photo galleries) and even forms can be inserted quickly + positioned as you wish.

The application is SEO friendly with the URLs generated, automated sitemap and ability to edit meta tags for all pages.

Multilanguage websites are handled in a very flexible way; once a new language is added and the content is created, users can be auto-forwarded to the language matching the setting of their browsers.

There is a built-in newsletter module where you can collect e-mails and send good looking newsletters to users.

ImpressPages also has many other features including RSS support, spam protection for contact forms, logging + error-reporting for the administrator and more.

Clipperz, a free-to-use online password manager service, also has a free and open source version: Clipperz Community Edition for anyone preferring to host the application themselves.

The application can store any of your sensitive data like passwords, notes, PINs, etc. and can provide a one-click login to any website defined which is a time-saver.

When storing passwords online, security should be the first concern and Clipperz handles it by encrypting data locally before it is uploaded with the help of a passphrase that never gets sent or saved to the server (check their powerful JavaScript Crypto Library).

Users can dump their encrypted data from Clipperz to create a portable version or for offline usage.

And, there is a stripped down edition designed for the Firefox sidebar which makes “direct logins” pretty easy.

Streeme is a free and open source application, that consists of both the server + frontend, allowing you to listen to your personal music collection anywhere.

Its front-end is HTML5-based and works in most modern browsers including smartphones.

The application is built with PHP, uses MySQL for storing the data and makes use of the FFMPEG library for transcoding media.

Streeme can get the music collection from any folders or it can use the iTunes XML file. After that, you can navigate music by genre, albums, artists or songs and see the latest additions.

With a click, you are ready to listen any item (has shuffle function as well).

ProcessWire is an open source CMS application that is built with PHP and simplicity in mind.

The application has a very low learning curve as there is no complexity and it is pretty developer/designer friendly considering it's built to adapt to your way of doing things.

With the help of a jQuery-inspired API (a big "plus" for jQuery fans), it gives you the tools to reach data, but you make the markup.

Anything can be built with ProcessWire as all page fields in it are custom fields. It's easy to edit, add, sort or remove fields from pages (via templates) as you see fit.

And, for maximum flexibility, fields can be as simple as containing raw text or numbers, or more complex like rich text editors, page-to-page relations and fields that hold files or images.

The application is friendly for end-users too as no details other than the "things-to-done" are displayed.

It has a modular plugin architecture for extending functionality and a must-check for any designer/developer (specially jQuery users).

Avactis is a powerful PHP shopping cart application that has multiple versions (including free + open source) and impressive features.

It has everything and more to expect from an e-commerce tool on every level from product to member managements, orders and marketing.

Unlimited categories and products with any number of images (auto-thumbnail support) can be created. Using "custom fields", you can better define a product and help users reach to it with a point-shot search.

The application is very flexible in creating any type of promotions like discount codes, price-based or quantity discounts discounts, built-in affiliate system, newsletter management and more.

SEO is taken care of -mostly- automatically with SEO-friendly URLs, optimized HTML code or breadcrumb navigation and more can be done with the help of custom meta information and titles.

Avactis works with almost every popular payment processor including PayPal, Google Checkout, Authorize.net and much more.

When it comes to frontend, the look and feel can be totally customized via CSS and templating system.

A CSS Editor, which actually works like a site builder, helps switching between styles and designing the storefront while browsing it.

Modules like featured products, newsletter subscription, registration can be positioned with a "Visual Layout Editor".

Simply, Avactis is a complete software for creating and managing an online store. And, besides the paid ones, it also has a free version.

The giveaway

Sitepoint and Avactis are running a giveaway of 50 Avactis full licenses with Brandon Eley & Shayne Tilley's "Online Marketing Inside Out" (Online Marketing: Sitepoint) book. You can join it from the link above and act fast as it'll be expiring soon.

DaDaBIK is an open source and mature PHP application for creating a customizable database front-end without coding.

Within minutes, you can create a basic CRUD (create, read, update, delete) application or dive into its features to build a more complicated one.

It doesn't generate a PHP script, stores the settings and can easily adapt to changes made in the database schema.

The application works with MySQL, PostgreSQL, Oracle + MS SQL Server and has features like choosing:

• if the field must be included or not in a search/insert/update form and results table
• labels
• content format (e.g. numeric, alphabetic, e-mail, url…)of a field
• the HTML input type (e.g. textbox, menu, date, rich text editor, password box…)
• the possible values, also driven from another table (foreign key support)
• and much more…

Some other exciting features include:

• master/details view (attaching 2 or more tables to each other like choosing a user from "users" table and seeing his orders from "orders" table)
• file uploading
• exporting to CSV
• e-mail notices

DaDaBIK is multilingual with support for 10+ languages.

LiteCommerce is an open source and free e-commerce application that integrates with Drupal to make use of the powerful CMS capabilities.

The connection to Drupal is optional and it can also work as a standalone online store.

Unlimited number of products or categories can be created, a product can belong to multiple categories and it has support for inventory tracking.

When connected to Drupal, it becomes more powerful in means of SEO as well with the ability to create search engine friendly URLs and custom meta tags.

The application has various options for easier marketing like wholesale pricing, discounts or gift certificates.

Shopping experience for the end-user is very smooth with Ajaxed catalog pages with a drag 'n' drop shopping cart, product images with zooming and more.

LiteCommerce, for now, integrates with PayPal, Google Checkout and Authorize.NET as the payment processors and has a flexible pricing functionality on every level (product, tax, shipping..).

Users can view past orders, track shipping status and admins have many tools to manage the system including invoice printing and importing/exporting data.

And, this e-commerce software has a detailed admin interface to control it easily.

Vermis is an open source application, built with PHP-MySQL, for tracking issues and managing projects effectively.

It is focused on software/web development projects and aims to improve the quality of code, efficiency and speed of development.

Once a project is started, you can add developers, project leaders and observers. Each of them can create + assign issues and comment on the project.

There are several issue types: task, bug, feature, improvement and refactoring to better define each entry.

Users get notified of any updates made to issues via automatically sent e-mails and every issue has a status, priority and graphical progress bar to easily see a snapshot of it.

The application is also multilingual and there are already few ready-to-use translations.

JobAppr is an open source PHP application to setup a job board in minutes.

It is possible to create categories (like graphic design, web development, copywriting, etc.) where the job listings will be placed under.

Submitting new job listings can be defined t be free or paid and you can even charge for highlighting an ad (PayPal is already integrated).

Employers can mention information like the title, location, category, details, "how to apply" and more.

There is a RSS feed for all listings and an admin panel is provided to manage the system.

Ushahidi, a non-profit tech company, is sharing 2 open source platforms for information collection and visualization: Ushahidi and SwiftRiver.

Ushahidi Platform

The application allows anyone to submit information through multiple channels including text messaging using a mobile phone, email or web form.

This collected data is displayed in an interactive map in real-time.

Reports can be tracked on the map and over time. You can filter your data by time and then see when and where things happened.

SwiftRiver Platform

The application enables the filtering and verification of real-time data from channels like Twitter, SMS, Email and RSS feeds. Just like an like an open source Yahoo Pipes.

You can setup streams that search for mentions of your brand or product online and manage social media campaigns (e.g. Twitter, SMS, email) from a single dashboard.

It also helps users to discover nascent relationships and trends in data sets that may appear to be unrelated.

Both applications are built with PHP and require MySQL for storing data.