agg-2.6
libRocket
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
agg-2.6
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Codebases to read
For example, if you are interested in 2D software rendering, check out antigrain library (https://github.com/ghaerr/agg-2.6) - it uses a lot of templates and interesting patterns that maybe you want to get familiar with, and as a bonus it has nice features that you can understand after few days exploring of that codebase.
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[Discussion] What are some old C++ open source projects you wish were still active?
There exist a couple of forks (one, two), but activity is low.
libRocket
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GUI for software, not games, but lighter than Qt ?
it's a fork of https://github.com/libRocket/libRocket which was started a long time ago.
- [Discussion] What are some old C++ open source projects you wish were still active?
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Best engine/tools to make games that are purely UI?
I've found libRocket to be a great UI library paired with SDL2 and OpenGL. It allows you to use a subset of html and css to design your UI, while handing rendering off to the renderer of your choice. This gives you the flexibility to add advanced visual effects during the rendering step.
What are some alternatives?
birdtray - new mail system tray notification icon for Thunderbird
sciter - Sciter: the Embeddable HTML/CSS/JS engine for modern UI development
VTK - Mirror of Visualization Toolkit repository
RmlUi - RmlUi - The HTML/CSS User Interface library evolved
ImGuiColorTextEdit - Colorizing text editor for ImGui
imgui - Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies
cppcoro - A library of C++ coroutine abstractions for the coroutines TS
CEGUI
LevelDB - LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values.
QCustomPlot
simdjson - Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks
MyGUI - Fast, flexible and simple GUI.