Ought has pivoted ~twice: from pure research on factored cognition to forecasting tools to an AI research assistant.

I don't know if you'd count this as a "pivot," but: Why Anima International suspended the campaign to end live fish sales in Poland 

Most funders would probably not be okay with this unless the grant was exploratory in nature. 

I'm just flagging that I've found the opposite to be true of the EA funders I have worked with - I've been explicitly told by funders that they hope we do find places to pivot, or at least adapt to what we find. And most projects I've worked on have done so, to a greater or lesser degree. 

In an update on Sage introducing quantifiedintuitions.org, we described a pivot we made after a few months:

As stated in the grant summary, our initial plan was to “create a pilot version of a forecasting platform, and a paid forecasting team, to make predictions about questions relevant to high-impact research”. While we build a decent beta forecasting platform (that we plan to open source at some point), the pilot for forecasting on questions relevant to high-impact research didn’t go that well due to (a) difficulties in creating resolvable questions relevant to cruxes in AI governance and (b) time constraints of talented forecasters. Nonetheless, we are still growing Samotsvety’s capacity and taking occasional high-impact forecasting gigs.

[...]

Meanwhile, we pivoted to building the apps contained in Quantified Intuitions to improve and maintain epistemics in EA.