Browse free open source Lazarus Debuggers and projects below. Use the toggles on the left to filter open source Lazarus Debuggers by OS, license, language, programming language, and project status.

  • Gemini 3 and 200+ AI Models on One Platform Icon
    Gemini 3 and 200+ AI Models on One Platform

    Access Google's best plus Claude, Llama, and Gemma. Fine-tune and deploy from one console.

    Build generative AI apps with Vertex AI. Switch between models without switching platforms.
    Start Free
  • Catch Bugs Before Your Customers Do Icon
    Catch Bugs Before Your Customers Do

    Real-time error alerts, performance insights, and anomaly detection across your full stack. Free 30-day trial.

    Move from alert to fix before users notice. AppSignal monitors errors, performance bottlenecks, host health, and uptime—all from one dashboard. Instant notifications on deployments, anomaly triggers for memory spikes or error surges, and seamless log management. Works out of the box with Rails, Django, Express, Phoenix, Next.js, and dozens more. Starts at $23/month with no hidden fees.
    Try AppSignal Free
  • 1
    Lazarus

    Lazarus

    Rapid applications development tool and libraries for FPC

    The Lazarus IDE is a stable and feature rich visual programming environment for the FreePascal Compiler. It supports the creation of self-standing graphical and console applications and runs on Linux, FreeBSD, MacOSX and Windows.
    Leader badge
    Downloads: 22,137 This Week
    Last Update:
    See Project
  • 2

    FBProfiler

    Firebird database server profiler and tracer

    Firebird 2.5 is required at least Monitor and trace Firebird activity on Windows and Linux. Let DBA to get the traces and send them to you when you can't access to production server. Watch query duration and plan.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 3

    Raw TCP tester

    To send and recive TCP strings and handle connections

    Handle every connection on different windows really simple, like chatting! Whit this too you can start a server, what listens on a specific port and/or connect to a specific host name with a specific port. The incomming/outgoing connections are appearing in popup windows. Written in Lazarus
    Downloads: 0 This Week
    Last Update:
    See Project
  • 4
    versaloon

    versaloon

    Universal programmer/debugger. Universal embedded software framework.

    Versaloon Platform is a next gerenation embeded developpment platform based on OOC. It implements a unique HAL layer for all target chips supported. And it will, if implemented, support more then 10 kinds of target chips, provide drivers for more than 100 pheripherial chips, provide generic software stacks(including USB, Wifi...), provide an featured FSM system(with semaphore, mutex support). Versaloon is also a USB dongle providing JTAG, SWD, SPI, IIC, GPIO, PWM, MicroWire, USART, EBI and so on.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Custom VMs From 1 to 96 vCPUs With 99.95% Uptime Icon
    Custom VMs From 1 to 96 vCPUs With 99.95% Uptime

    General-purpose, compute-optimized, or GPU/TPU-accelerated. Built to your exact specs.

    Live migration and automatic failover keep workloads online through maintenance. One free e2-micro VM every month.
    Try Free
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