This python script converts a Apple "Contacts Archive" (eg, My Contacts.abbu) into a nice JSON format. It also extracts images stored in the .abbu file. In Apple's "Contacts" app, File > Export lets ...

Use Google Takeout to download your Mail data in MBOX format. Keep the default setting which is "All Mail data included" (click the setting and select "Include all messages in Mail" if it shows ...