Sync contacts between CSV and countless other apps

A comma-separated values (CSV) file is a delimited text file that uses a comma to separate values. Each line of the file is a data record. Each record consists of one or more fields, separated by commas. The use of the comma as a field separator is the source of the name for this file format. A CSV file typically stores tabular data (numbers and text) in plain text, in which case each line will have the same number of fields. The CSV file format is not fully standardized. Separating fields with commas is the foundation, but commas in the data or embedded line breaks have to be handled specially. Some implementations disallow such content while others surround the field with quotation marks, which yet again creates the need for escaping these if they are present in the data.
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Sync contacts between CSV and other apps like:

AGFEO
AGFEOtel
Android
Apple iCloud
Apple iOS
Apple iPhone
Apple macOS
Apple OSX
Asterisk
AVM FRITZ!Box
CardDAV
corpoTel
DATEV
Deutsche Telefon Tk-Anlage CentrexX
DocBee
Gigaset
Google Contacts
Google GMail
Google Nexus
Google Pixel
GSuite
HubSpot
INOPLA
LDAP
Microsoft 365
Microsoft 365 Shared Mailbox
Microsoft Active Directory
Microsoft Dynamics 365
Microsoft Exchange Global Address List (GAL)
Microsoft Graph API
Microsoft Office 365
Microsoft Outlook
Microsoft Teams
Mozilla Thunderbird
MyCRM
NFON
o2 digital phone
Pascom
PhoneSuite
Pipedrive
Placetel
salesforce
Sipgate
snom
STARFACE
SugarCRM
UCware
Unify
weclapp
XELION
Yealink
Zendesk
Zoho