I'm a development freelancer/subcontractor (if it's not the same within the described question) and I provide web frontend and backend development on a couple of popular open source CMS.
I run my own website and social media and I was wondering if it's ok (legal), to post information about me being involved in a project, as subcontractor, but without mentioning the middle man's name. So literally something like 'I was subcontracted to develop a new website for company X, check out the results - link to website'
I'm asking about sort of 'default' rules as contract had not mentioned anything specific regarding NDA, copyrights etc.