SourceForge is in trouble.
The download-hosting site retreated after public outcry, removing the junkware it inserted into downloads of the popular GIMP image editing tool without the developers' permission. But SourceForge has still lost the trust of the open-source community after the junkware-wrapping scandal--and now more open-source projects are leaving SourceForge for greener pastures like GitHub and FossHub.

Wine and Notepad++ are leaving
The Wine project--which makes the Wine compatibility layer for running Windows applications on operating systems like Linux and Mac OS X--seems to be moving away from SourceForge. The Wine newsletter indicates a developer proposed moving away from SourceForge due to "SourceForge's recent activities with taking over open source projects for their own gain." Developers reacted positively to the idea, and Wine looks like it will be moving off of SourceForge going forward.
Wine isn't the only big-name program looking to flee SourceForge. Notepad++ is a popular programming-focused text editor for Windows. In an announcement, its developer wrote that Notepad++ would be leaving SourceForge and requested other open-source projects do the same. "SourceForge was a good place; unfortunately, sometimes good places don't last," he wrote.

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Bundling junkware along with open-source projects against their developers' wishes is the last straw when those developers are struggling to provide free, safe-to-use software without the junk.
VLC and GIMP started the exodus in 2013
Other smaller projects have also moved away from SourceForge recently. If you're wondering why there hasn't been more of an exodus of big projects, it's because many open-source projects really started moving away from SourceForge back in 2013.
VLC was the biggest, most-downloaded application on SourceForge in 2012. But SourceForge hosted misleading ads that encouraged users to download VLC and other applications from other websites where they were bundled with junkware. SourceForge wouldn't remove the ads, so VLC left and began hosting their own downloads.