STScI Software

A complete list of STScI Software is under development.

Astronomer's Proposal Tool

Used to write, validate and submit proposals for the Hubble Space Telescope and the James Webb Space Telescope.

Exposure Time Calculator (ETC)

Assists Hubble astronomers and engineers in preparing Phase I and Phase II observing proposals for submission to the Space Telescope Science Institute (STScI).


A software package for aligning and combining HST images, bringing an array of new features and algorithmic improvements over the prior, widely used MultiDrizzle software.