My pet peeve is progress bars that increment based on the units of work, rather than extrapolating to an estimated time remaining. When there is no real correla

My pet peeve is progress bars that increment based on the units of work, rather than extrapolating to an estimated time remaining. When there is no real correlation between how long different segments of the progress bar will take to complete, it basically becomes useless to me. My general perception is that most commercial software is putting in the effort to calculate time remaining these days. Are there any open-source tools that help with this? It would be awesome to collect analytics during development (opt-in in production) and apply it to calculate more and more accurate time estimates.