Top 5 C++ Experimental Projects

Experimental

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1. carbon-lang

   1 197 33,550 9.9 C++

   Carbon Language's main repository: documents, design, implementation, and related tools. (NOTE: Carbon Language is experimental; see README)

   

   Project mention: Fast, Memory-Efficient Hash Table in Java: Borrowing the Best Ideas | news.ycombinator.com | 2025-12-15

   FYI, we ended up implementing a _really_ nice SWAR version in the Carbon derivative of SwissTable that might be worth looking at for inspiration: https://github.com/carbon-language/carbon-lang/blob/trunk/co...

   Can see the rest of that file and the adjacent `raw_hashtable.h` for the rest of the SwissTable-like implementation and `hashing.h` for the hash function.

   FWIW, it consistently out-performs SwissTable in some respects, but uses a weaker but faster hash function that is good enough for the hash table, but not good for other use cases.

2. InfluxDB

   www.influxdata.com featured

   InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

   

3. E-TKT

   2 4 447 6.6 C++

   open source embossed label maker

   

4. Bolt

   3 1 44 6.8 C++

   A programming language for rapid application development (by boltlang)

   

   Project mention: Show HN: Bolt – A super-fast, statically-typed scripting language written in C | news.ycombinator.com | 2025-08-10

   I'm aware of 4 now. Here are the other 3:

   https://github.com/mukul-rathi/bolt - Bolt is a language with in-built data-race freedom!

   https://github.com/boltlang/Bolt - A programming language for rapid application development

   https://sourceforge.net/projects/boltprogramming/files - BOLT is a programming language that was desinged for begining programmers who have never seen code before in their life

5. fastcoin

   4 0 32 - C++

   FastCoin (FST)

   

6. kernel

   5 1 2 5.7 C++

   The Kernel of AntOS (by ant-os)

   

7. Stream

   getstream.io featured

   Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

   

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Sponsored

InfluxDB – Built for High-Performance Time Series Workloads

InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

www.influxdata.com

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