Joomla is the second-most popular content management system behind WordPress. Similar to WP, it can be used to build a variety of websites and applications for businesses, schools, non-profits, online stores, and so much more. Because Joomla doesn’t offer a paid option like WP and is geared towards a more experienced user, your only means of support is searching through their forums and developer communities for help.
Although not so popular among the users, Craft CMS is an effective content management system. Some major examples of this are Netflix and Salesforce websites. It is a much more complex and developer friendly CMS platform that provides exclusive back-ends for your websites. Unlike WordPress, it does not provide front-end themes that you can use. Instead, you can use their templating system that is powered by Twig to design it yourself.
It is widely popular and the WordPress Gutenberg editor is also inspired by the Medium post editor. And if you are looking to reach out to a wider range of audience, then Medium wins it hands down. While WordPress has a large range of users overall, Medium has an average of 60 million blog readers per month. This alongside other awesome features makes it an awesome blogging alternative for WordPress.
You are mistaking the problems with WordPress as something that is inherit in PHP. That might have been true years ago, but modern php (php7 and hhvm) is a very powerful and mature language with rock solid performance, and in the case of hhvm that performance is equal to native,and in many cases faster than even C++. When written correctly and running in the right architecture it scales seemlessly and delivers low latency and high throughput. Sorry if you thought you could pay some indian 3 bucks an hour to slap together a wordpress site and be the next facebook.
As the Weebly team states, the idea behind the platform is to make website creation available for everyone — not only programmers. Weebly remains one of the easiest-to-use site-building solutions out there. It delivers great tools for creating straightforward sites that serve specific purposes. Weebly is another hosted solution, which means that it takes care of housing your site and all the technical details related to it.