There is a lot of VPN services out there, but only some of them support open source comunity by sharing the source code of their desktop and mobile clients.

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ProtonVPN

Based in Switzerland, this company offers free and paid VPN plans and the source code of their client apps is available on https://github.com/ProtonVPN.

Paid plan prices start at €4 per month (12-month plan).

ProtonVPN

Mullvad VPN

This VPN provider is based on Sweden and offers a flat €5 per month plan. You can check their apps source code on https://github.com/mullvad/mullvadvpn-app.

Mullvad VPN

Mozilla VPN

Even Mozilla has a VPN service from €4.99 per month (12-month plan). Client source code available on https://github.com/mozilla-mobile/mozilla-vpn-client.

Mozilla VPN

Private Internet Access

Based in United States, this provider offers VPN from €3.10 per month (12-month plan). Check source code for all their official clients on https://github.com/pia-foss.

Private Internet Access