What external libraries and tools have you used in your projects?

Projects in C/C++ often use the following external libraries and tools:

• Boost — a set of libraries to extend the C++ standard library (smart pointers, containers, algorithms).
• Google Test (gtest) — a framework for unit testing.
• CMake — a tool for cross-platform project building.
• OpenCV — a library for computer vision and image processing.
• Poco — libraries for network programming and multithreading.

Example of using Google Test:

#include <gtest/gtest.h>

TEST(MathTest, Addition) {
    EXPECT_EQ(2 + 2, 4);
}

int main(int argc, char **argv) {
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}