Tunes - Tuneflow

Firefox only (Windows/Mac/Linux): The Flickr Gallery Plus Firefox extension or Greasemonkey script make browsing galleries faster and easier in Flickr.

Google has officially released their popular photo management application Picasa for Macs, after years of offering Picasa as a free Windows download. It's an exciting announcement for anyone who's looking for a good photo management app on OS X that isn't iPhoto or for anyone who's used and fallen in love with Picasa on Windows or Linux. This release still sports the beta tag, so you can expect a bug here or there, but overall it appears to boast most of the same features as its counterparts. That includes:

Firefox only (Windows/Mac/Linux): The Tabhunter Firefox extension adds quick keyboard-based tab switching to Firefox—sort of like Launchy for Firefox tabs. Just invoke Tabhunter, start typing, and Tabhunter searches for a match through all your tabs.

Windows only: Free application Disable Startup keeps just any old app from adding itself to your list of startup applications, keeping your boot time snappy and RAM happy.

iPhone/iPod touch only: Free online sharing service Soonr has launched an iPhone/desktop app combo that gives you 500MB of space to keep your Windows or Mac documents synced to your device.

Most anyone using Ubuntu Linux has to install Adobe Flash, Java, DVD playback, and other plug-ins to actually enjoy it. Super Ubuntu packs all that essential in from the get-go.

Windows only: A small background app can give XP and Vista users part of the functionality of "Aero Peek," a smart way of previewing windows and showing the desktop in Windows 7.

Windows only: WindowsPager is a free and light-weight application for managing virtual desktops. The application is just over 300k and uses around 5MB of system memory.

Windows only: We've already highlighted the best free video conversion tools, but if you want to both edit and convert a video, those apps aren't up to it. That's where Free Video Converter comes in. Free Video Converter lets you choose sections of any video and join or split clips so that once you're ready to export or convert the video, you get final say on what you see.

Macworld's Dan Frakes shows off his favorite screensavers for Mac OS X in this video clip and many (but not all) are free, including AlphaBabySaver, Big Time Screen Saver, Econ, and Euphoria.