$ ExposureBuddy
ExposureBuddy turns a burst of phone photos into a long exposure. It lines every photo up on the static scene and stacks them: the houses stay sharp, whatever moved fades into a translucent ghost, and headlights become light trails. Everything runs in your browser, so your photos never leave the device.
Screenshots
Pick Your Burst
Choose a burst of photos shot from one spot, pick an output size, and combine. The scene comes out sharp while whatever moved fades into a ghost, and all of it happens in your browser.