Command-line tool to parse large log files and compute stats (top errors, latency histograms). Used C++17/STL, wrote benchmarks, and profiled hot paths to get ~3× speedup vs baseline.

Perforator is a cluster-wide continuous profiling tool designed for large data centers

Frame profiler

Near-zero-overhead, in-process CPython frame stack sampler with async support

Real-time C++17 monitoring and metrics collection library with optional C++20 features. Performance counters, system resource tracking, and alerting with low-overhead instrumentation and integration with popular monitoring tools.

C/C++ build profiler based on clang time tracing.

Omnitrace: Application Profiling, Tracing, and Analysis

The Datadog Native Profiler for Linux

Linux OTF2 Sampling - A Lightweight Node-Level Performance Monitoring Tool

Collection of self-contained header-only libraries for C++17

C++2x Performance library

Amrvis is a visualization package specifically designed to read and display output and profiling data from codes built on the AMReX framework.

Kokkos C++ Performance Portability Programming Ecosystem: Profiling and Debugging Tools

Generate profiling traces for GCC

Runs a single CUDA/OpenCL kernel, taking its source from a file and arguments from the command-line

Performance benchmarking C++ applications [SSC Compact Course]

Very basic header-only library for C++ instrumentation and create a Paraver Trace.

Performance event profiles (pep) speak many languages! Count me in.

Performance markers for Tracy Frame Profiler in Zig.

The Linux perf GUI for performance analysis.