Alternatives

Products that do what TOTP Based Port Knocking -- two factor firewall does

1. 1MU
   My user-friendly outbound firewall for Mac▲77

   2011 · radiosilenceapp.com

2. 2AP
   A proof-of-concept FoundationDB based network block device backend▲192

   2018 · github.com

3. 3TR
   Tunshell – Remote shell into ephemeral environments behind NAT/firewall▲70

   2020 · github.com

4. 4DA
   DHCP as a file system – an experiment with Go and FUSE▲34

   2015 · github.com

5. 5AU
   A UDP to TCP proxy server for sending HTTP requests with zero latency▲146

   2020 · github.com

6. 6OA
   Ouroboros – A Decentralized Packet Network▲116

   2020 · ouroboros.rocks

7. 7AE
   An etcd backed DHCP server▲83

   2017 · github.com

8. 8TA
   Twingate – A modern solution for remote access▲156

   2020 · twingate.com

9. 9OS
   Ondevice SSH – Terminal emulator for devices without public IP address▲152

   2017 · ondevice.io

10. 10MM
    Mosh Mallet: Single packet UDP port knocking for Mosh without SSH▲22

    2021 · gitlab.com

11. 11BA
    Broxy – An HTTP/HTTPS intercept proxy written in Go▲106

    2020 · github.com

12. 12RE
    RadioSilence. Easy to Use OS X Firewall▲32

    2016 · radiosilenceapp.com

13. 13DA
    Dog – a distributed firewall management system▲20

    2021 · relaypro-open.github.io

14. 14
    TinyHardwareFirewall▲78

    When a VPN Alone Is Not Enough

    2014

15. 15PR
    PandwaRF – RF Hacking Tool with Sub 1GHz RF Transceiver, BLE and USB▲60

    2016 · github.com

16. 16TV
    Tiny VPSs without exhausting IPv4 addresses▲95

    2014 · definedcodehosting.com

17. 17FE
    Firewall – Extreme Robocall Blocker▲16

    2019 · apps.apple.com

18. 18CA
    Chomper – An Internet Blocker for Linux▲24

    2018 · github.com

19. 19WO
    Wake-On-LAN without public IP or port-forwarding▲18

    2014 · baconpi-jeffijoe.rhcloud.com

20. 20IF
    inletsctl – Fast HTTP (L7) and TCP (L4) Tunnels▲11

    2019 · github.com

21. 21RP
    Raspberry Pi WiFi extender/router/ad-blocker to filter all DNS traffic▲13

    2020 · unop.uk

22. 22VS
    Very Simple TCP/UDP Proxy▲5

    2016 · github.com

23. 23IS
    Inletsctl – self-hosted network tunnels▲13

    2019 · github.com

24. 24ED
    Event-driven, user-space and highly-scalable TCP/IP stack [pdf]▲29

    2015 · github.com

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