Today we're releasing a new Aseprite beta version with new features:

• Added slice tool (still a work-in-progress as animated slices need more UI work).
• Added automatic guides when moving cels/layers
• Added possibility to move selection edges
• Added possibility to open multiples files at once
• Added horizontal/vertical symmetry at the same time
• Improved handling of overlapping frame tags in the Timeline
• Improved Sprite > Canvas Size option: now we can drag the canvas and corners
• Show Unicode filenames correctly (Chinese, Japanese, Korean, etc.)
• Added new keyboard shortcut Shift+E to open/close a layer group
• New command to switch "Contiguous" mode on Paint Bucket tool (no default shortcut yet)
• Improved performance previewing effects (like Replace Color, Convolution Matrix, etc.)
• New mail24 color palette (thanks to @Hyohnoo)
• New matriax8c color palette (thanks to @DavitMasia)
• Added a search field in the fonts popup.
• macOS: Fixed memory leaks on paint events and changing mouse cursors
• macOS: Fixed several keyboard issues (mainly on special non-US keyboard layouts, like "Dvorak - QWERTY ⌘")
• Fixed soft light layer blending mode to match the CSS-SVG definition.
• Fixed a problem resetting default grid settings
• Fixed delay problems playing animation on the active editor and the Preview window at the same time
• Fixed changing layer properties of several layers at the same time

More information in Aseprite blog announcement.