Compressing webpages, built in mail, built in BitTorrent client, tab stacking, "fit to width" which would remove horizontal scrollbars, page tiling, mouse gestures, rocker gestures, I think it even had a calendar.
It's a shame the direction Opera took after Jon left, but thankfully he started Vivaldi which feels like the spiritual successor.
Opera also invented the browser Speed Dial, which was super handy back in the day.
But most importantly, Opera invented tabs, or at least the concept of tabbed browsing. I recall using Opera on Windows 3.11 and for the longest time, even during the Win 9x era, no other app used tabs.
In addition to mouse gestures, they had customisable keyboard shortcuts for practically every browser feature, again, something which very few apps bothered with.
The page compression built into Opera Mini was a life saver on Symbian and Windows Mobile devices back in the 2G/GPRS era. Opera Mini loaded pages blindingly quick and there was nothing else like it on the market, even leading up to early Android days.
but thankfully he started Vivaldi which feels like the spiritual successor.
Too bad he made the unfortunate decision of going with the Chromium engine instead of Gecko, or even making their own engine. I would've loved to use Vivalidi if it weren't for that fact.
Opera also invented full page zooming. Originally, browser zoom would only increase text size - everything else (including images, the actual page layout, etc) would remain the same size. Opera was the first browser to instead zoom into the entire page.
It also had a lot of features that either require extensions or don't even exist these days. Things like being able to disable JavaScript or change the User-agent per-site, basic content blocking before ad blockers existed (like modern-day ad blockers but you'd manually build your own list of things to block by going into content blocking mode and clicking on them), an option to only show cached images (useful on slow dial up connections), a fully customizable UI (literally every toolbar, button, and status bar segment could be moved around), and many more.
It was truly a web browser for the future, far far ahead of its time. I miss those days.
Uh... You must not know much about the history of browsers. Practically every browser designed for consumer operating systems cost money back then. Netscape Navigator was made free, but only for individuals, academics and researchers. Many individuals still paid for the full Netscape Communicator suite though. Netscape's IPO was probably the most successful tech IPO ever at the time, and their revenue increased significantly quarter over quarter. People would go to shops and buy boxed copies of Netscape.
That was the case until Microsoft bundled IE with Windows. That was one of the major points of the Microsoft antitrust lawsuit - browser developers were losing a lot of money because Microsoft were abusing their dominance and bundling IE for free.
Netscape became fully free in 1998 since there was not other way they'd be able to compete with IE. The code was open-sourced and became what we know as Firefox today.