SMPlayer intends to be a complete front-end for MPlayer (video player), from basic features like playing videos, DVDs, and VCDs to more advanced features like support for MPlayer filters and more.
Gnome system restrictions utility Lockdown Editor lets you create a profile that limits a user to a set of application that a system administrator allows. It has a nice, logically structured GUI that allows administrators to choose and click checkboxes on the options that you want to deny for user access.
Linux Video Converter makes it easy to convert your videos ready to be uploaded into video sharing websites (low-resolution high-quality). For now, it only supports YouTube but probably formats for other websites will be added soon.
Liferea developers have announced the availability of the first stable version of the 1.6.x series. Liferea (Linux Feed Reader) is an aggregator for online news feeds. There are many other news readers available, but these others are not available for Linux or require many extra libraries to be installed.
khtml2png is a helpful tool for capturing an image of a webpage with ease.
Heroes of Newerth is an online, multi-player strategy game that is based upon DoTA (Defense of the Ancients) currently in closed beta, but S2 Games sent Phoronix Media 400 beta keys to giveaway and they say they can get even more.
SMILE is a simple and easy to use application for creating video slideshows in minutes.
In Ubuntu, some people have experienced some issue with the subpixel smoothing of fonts for Firefox 3.5. To fix this font issue in Firefox 3.5 there are 2 possible solutions:
One Hundred Paper Cuts is a project which attempts to fix 100 usability errors reported by the users for the new Ubuntu 9.10 Karmic Koala.
Ubuntu Sources List Generator is a website where you can generate a sources.list file with a lot of useful repositories. Besides the usual Ubuntu main, restricted, universe, multiverse, updates and so on you can choose from many others.
Nexuiz is a free open-source first person shooter that runs on Windows, Linux and OSX. It's a 3d deathmatch game that has been in development since the summer of 2002.
Audacious is a free, lightweight advanced audio player based on GTK2 which runs on Linux and many other *nix platforms and is focused on audio quality and supporting a wide range of audio codecs. Ubuntu 9.04 Jaunty Jackalope comes with Audacious 1.5.1 while version 2.1.0 is already available for download so if you really like Audacious, I bet you can't wait to upgrade.
Though you can now enable Flash on Google Chrome for Mac, the Linux still doesn't have support. However, if you're willing to run Chromium instead of the official Google build, you're in luck.
Gnome-Art Next Generation is the successor of Gnome-Art and lets you change your Gnome-themes (icon-, wallpaper-, splash-,...-themes) with one click. It is in an early stage and under development but it looks very promising already.
Firefox 3.5.1 is the first update to the new 3.5 series of Firefox. According to the users' changelog, this release fixes several issues, including security and stability-related problems.
Rhythmbox is the default audio player coming with the GNOME desktop environment, featuring a clean, typical interface which is so common for GTK audio players. I could say that Rhythmbox has little missing features and it is rather complete.
This guide explains several methods on installing the latest Firefox in Ubuntu, including installing it from a PPA repository.
Yakuake is a drop-down terminal emulator based on KDE Konsole technology which looks like the Quake console coming down from the top of your desktop when you press F12.
CMus (C* Music Player) is an ncurses-based audio player that runs in a shell, with no need for an X server which is very configurable with Vi-like commands, multiple views and keyboard shortcuts. It supports various audio formats, including Ogg Vorbis, FLAC, MP3, WAV, AAC or WMA.