MATE Desktop has a number of active Bounties at Bountysource.
If you're a developer that happens to have some free time, here's a list of Bounties:
$20 caja » [Feature Request]: Switch tabs with CTRL+ TAB
$10 caja » GTK3: Backgrounds and Emblems dialog does not work
$15 marco » [Feature Request]: Show workspaces when moving windows with the keyboard?
$25 marco » Multi-monitor keyboard shortcuts
$5 mate-panel » [Feature Request] Keyboard shortcut to show auto-hidden (top) panel?
$120 mate-panel » Feature Request: ‘Sticky-Center’ property for panel items
$50 mate-panel » workspace switcher with compiz can't drag and drop windows
$10 mate-panel » Clock Applet without networking
$25 mate-panel » [1.18] panel can't load launchers for files/folders
$350 mate-applets » [Request] Add additional mouse settings for disabling mouse acceleration and middle click emulation
$10 mate-indicator-applet » GTK+ 3.18/20/22: indicator-applet-complete doesn't follow panel's bg color
$10 mate-applets » [GTK+3] Sticky Notes - Can't select text
$30 pluma » [Feature Request]: Switch tabs with CTRL+TAB
$20 pluma » Comment / Uncomment multiple lines
$20 pluma » [Feature Request] - Keyboard Shortcut to increase font size.
$20 pluma » Allow hiding of tabbar
$20 pluma » Optimize Find dialog menu in Pluma
$100 pluma » Wishlist: multiple cursor support
$10 pluma » Context menus use a monospace font.
We put out a couple of more Bounties today on mate-notification-daemon, and bumped the gvfs Bounty regarding this issue:
Also, the OP is now a Wiki, if you want to list other bounties you care about, feel free to do so.
Added a new waves of bounties for: