free opensource

Does anyone know of a nice, lightweight tool to combine PDF files? Have previously been using combinepdf.com but for work, I don't think it meets GDPR regulations... So looking for a tool to combine locally. Thanks in advance 😊

I've used this software for many years, apparently its been on the go for 20 years now! Not that I use it for any thing superbly technical, although it is very powerful software. Home page https://www.audacityteam.org/ Download: https://www.audacityteam.org/download/