Balloonist is a comics layout application for comics artists and comics-minded graphics designers.
As you move your balloons around the workspace, Balloonist keeps their text centered... even when they're clipped to the boundary of a panel or another balloon. There's full support for Undo, margins, text styling, and the vertical orientation of Japanese & Chinese writing. Merged and tied ovals are a given.
Balloonist integrates seamlessly into existing design workflows through its support of PDF and SVG. It even lets you change the rectangularness of ovals, fit panels to a page, and drag the gutters between panels!