app-i18n/ibus-libpinyin - The most used ibus engine for Traditional and Simplified chinese latin input

app-i18n/ibus-m17n - Provides a wide variety of ibus input engines

app-i18n/ibus-pinyin - Second most used ibus engine for Traditional and Simplified Chinese 

app-i18n/ibus-anthy - The most used ibus engine for Japanese  
app-i18n/ibus-rime - Another Chinese ibus input method
app-i18n/ibus-table - The standard ibus table
app-i18n/ibus-table-chinese - The standard ibus table for Chinese input
app-i18n/ibus-table-extraphrase - Provides extra phrases for Chinese
app-i18n/ibus-handwrite - Provides hand write input recognition to ibus 

dev-util/glslang - Provides a lot of tools for compiling GLSL shaders for Vulkan and Modern OpenGL

dev-util/spirv-headers - Provides C/C++ headers to interact with the low level SPIRV compiler API(SPIRV is the shader cache format for Vulkan and can also be used for modern OpenGL) and is used by many custom Vulkan and OpenGL applications for their custom internal shader compilers

dev-util/spirv-tools - Provides a bunch of C/C++ headers and tools to interact with the SPIRV compiler API, debug shaders, get shader reflection data and more information that Vulkan and Modern OpenGL applications require for debugging

dev-util/vulkan-tools - A repository providing tools to interact and debug Vulkan applications including vulkaninfo, vkcube and more

media-libs/vulkan-layers - Provides core Vulkan layers including validation layers that are used to do low level debugging and profiling of Vulkan applications at API level

media-libs/vulkan-loader - The client-side vulkan driver library, it loads the Vulkan entry points from the GPU driver, basically making any vulkan application work. It being not included basically breaks a large portion of Vulkan applications as most don't call the driver directly for entry points and use the Vulkan loader to not be affected by ABI breaking changes