A somewhat obscure one, but Xenword. In theory the idea was a good one; connect a XenForo install to a WordPress install so people could sign up/login with the

A somewhat obscure one, but Xenword. In theory the idea was a good one; connect a XenForo install to a WordPress install so people could sign up/login with the former and get access to various settings on the latter. In practice on the other hand, I found the integration a complete nightmare, and everything was very prone to breaking for random reasons, making it either impossible to login or so the data wasn't pulled in properly etc. And it's been a similar story with quite a few other software bridges/integrations. So much so in fact, that I realised it's almost always more practical to either find a solution that does both A and B at the same time, or to just build something yourself with the features needed rather than spend hours debugging an integration between two separate programs. Edit: Oh, and Adobe Target. Even for an A/B testing tool this thing is frustrating as hell to use, and has a ton of design decisions that make no sense at all. For instance, you can't track clicks on an element by class/ID if the class/ID doesn't exist on that page at the time you use the editor, meaning you can't track clicks on an element that exists on some of the pages you want to test but not others, or all items in a list/feed. You also can't easily run the same test on multiple different pages with different URLs, so you have to 'add a page' in the editor for each URL pattern and copy the code over to it again.