I think Safari is Apple.
I think you’re right.
Opera claims to be made by Opera Software. And Wiki has it as the third most popular browser.
From wikipedia: “Opera is a web browser developed by Opera Software. The latest versions of Opera use the Blink layout engine. Earlier versions used Opera Software’s proprietary Presto layout engine and had additional Internet suite features such as sending and receiving e-mail messages, managing contacts, chatting on IRC, downloading files via BitTorrent, and reading web feeds. Opera is offered free of charge for personal computers and mobile devices. According to Opera Software, the browser has over 300 million monthly users worldwide.[7]
“Opera is the third most popular mobile web browser as of November 2013.[8] Opera Mini has been chosen as the manufacturer’s default integrated web browser in several mobile handsets.[9][10][11]