Alternatives

Products that do what Critical Events Gateway (SDP) does

Manages critical banking notifications like OTPs and alerts

1. 1
   Cron▲1,208

   Next-generation calendar for professionals and teams

   2021 · cron.com

2. 2
   Recal.dev▲365

   Resend, but for Calendar & Scheduling. API. SDK. MCP.

   Sep 2025

3. 3
   Novu▲577

   The open-source notification infrastructure for developers

   2023

4. 4
   1Password Business▲485

   The most secure password manager for your business.

   2018

5. 5
   SuprSend▲409

   Setup notification infrastructure for all channels in 1 day

   2022

6. 6
   LeadrPro for Events▲379

   The networking app for events

   2024

7. 7AO
   An open-source notification infrastructure▲170

   2023 · github.com

8. 8
   Free Monitoring Suite by WebGazer▲338

   Monitoring for websites, APIs, and cron jobs

   2024

9. 9
   GitMails▲95

   Instant notifications for critical GitHub org events

   2022

10. 10
    GoStartup▲125

    Task management, chats, and a calendar all in one place.

    2022

11. 11
    Ethereum Push Notification Service▲76

    Protocol for incentivized, blockchain based notifications.

    2020

12. 12
    Halp▲194

    Slack-first ticketing for internal helpdesk

    2019

13. 13
    Open source Audit Logs (by BoxyHQ)▲112

    Track every critical event within your product

    2023

14. 14
    TaVivo▲100

    Monitor APIs or web services based on a configurable time

    2022

15. 15
    NFT Access▲95

    Multichain NFT event ticketing with Apple wallet integration

    2022

16. 16
    Tantl▲91

    Build event notifications and alerts on top of your data

    2022

17. 17GO
    GuMCP – Open-source MCP servers, hosted for free▲79

    Hello! We open sourced all our current MCP servers to platforms like Slack, Google sheets, Linear, Perplexity and will be contributing a few more integrations every day to the project. problems we're hoping to solve: - Many people are creating MCP servers for the same apps. They're scattered across different repos but flavors of the same thing. We're making one standardized mono project for all MCP servers. - Startups are charging for hosting MCP servers. This is blocking tons of people from being able to play around with MCP casually. We're hosting them for free. - Non-technical people…

    2025 · github.com

18. 18SO
    ServiceRadar – open-source Network Observability Platform▲61

    ServiceRadar is an open-source platform for distributed, secure network management and observability, scaling to 100k+ devices. Born from frustration with complex traditional NMS tools like Zabbix, it bridges legacy (SNMP/syslog) and modern (gNMI, OTLP) protocols for cloud-native environments. We built ServiceRadar to simplify monitoring hybrid telecom networks, evolving it into a Kubernetes-native solution with Helm and Docker support. It uses mTLS with SPIFFE/SPIRE, NATS JetStream for event streaming (90M+ EPS), and SRQL for intuitive queries. Integrated with OpenTelemetry,…

    Oct 2025 · github.com

19. 19
    FlowPulse▲68

    Know when your automations run, fail, or go quiet.

    Apr 2026 · flowpulse.sh

20. 20
    a11ops▲11

    Push notifications done right

    2025

21. 21SN
    SuprSend (Notification infrastructure for all channels)▲19

    2022 · suprsend.com

22. 22
    Conviso Platform - Complete ASPM▲7

    Visibility, automation and control for application security.

    Nov 2025

23. 23
    Cactoide▲39

    Federated mobile first open-source RSVP platform.

    Nov 2025 · cactoide.org

24. 24AO
    Auto-OTP: automatically send and receive OTPs, end-to-end encrypted▲20

    2022 · auto-otp.com

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