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You can right-click any file in Nautilus (the default file manager of Ubuntu), select "Properties" and switch to the "Open With" tab to change a file type's association (ie. the programs that appear when you right-click a file and go to the "Open With" list ... and the program that will open on a double-click). However Ubuntu has no app for managing all file associations together in a single UI. Eg. what if you'd like to know what file types are associated with Gedit. No problem: all of your personalized file associations are stored in the file $HOME/.local/share/applications/mimeapps.list (as defined by the freedesktop standard). Of course a lot of the "active" associations are not in your personal mimeapps.list file, since there's a system wide file containing the default associations: it's either in /usr/share/applications/mimeapps.list or in /usr/share/applications/defaults.list (or both ).

Using the attached Nautilus action, you can easily add a custom action in the context menu of Nautilus and create an ISO image from the selected files and/or directories. It works with filenames containing whitespace and supports selection of multiple items. It also remembers the last selected/entered file path + name (in case you create ISO images regularly). Requires genisoimage to be installed.

Gnome includes a utility called "Gnome Search Tool". It's available in recent Ubuntu versions both in the Accessories and in the Places menu with the name "Search for Files". The attached Nautilus Action launches this tool in the current (or the selected) directory with a few preset options. These options are:

• --hidden: selects the "Show hidden and backup files" search option
• --mounts: selects the "Exclude other filesystems" search option
• --contains="": selects the "Contains the text" search option

Using the attached Nautilus action, you can easily add a custom action in the context menu of Nautilus and convert the selected files to JPEG. It works with filenames containing whitespace and supports selection of multiple items. Requires ImageMagick to be installed and the convert executable to be available through /usr/bin/convert.

This is a fix for the whitespace issue with the original Generate Checksums action.

Using the attached Nautilus action, you can easily add a custom action in the context menu of Nautilus and calculate the MD5, SHA1 or CRC32 (as defined by POSIX.2 -aka. IEEE Std. 1003.2- standard) checksum of the selected files and/or for all files in the selected directories recursively. It works with filenames containing whitespace and supports selection of multiple items. By default the results are displayed in a 1000x600 window, but you can easily change that. The action requires zenity to display a dialog box for checksum method selection and display the results.

"Nautilus-actions is an extensions for nautilus which allow to add arbitrary program to launch through the nautilus popup menu of selected files. Each time you right-click on one or several selected files in nautilus, nautilus-actions will look at its configured actions to see if a program has been setup for this selection. If it is the case, it will add an item in the menu that allow you to execute the program on the selected files."