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Asynchronous Core Libraries

Low-level frameworks providing event loops, futures, and async/await support—enabling non-blocking I/O and high-concurrency applications.

The Linux Foundation

by The Linux Foundation

・

71 projects ・ Updated 14 Mar 2025

Project
Contributors
Organizations
Software value
Angular
22,381
3,579
$39M
Tokio
3,968
1,310
$3.4M
Tornado Web Server
2,614
796
$1.4M
libuv
2,612
797
$2.9M
Ktor
2,419
612
$6.7M
Hyperf
2,239
189
$11M
Embassy
2,176
472
$10M
ZIO
2,098
381
$7.1M
Axum
2,017
670
$1.2M
Async
2,014
751
$4M
Sanic
1,940
543
$2.9M
Bluebird
1,714
712
$1.6M
Tonic
1,669
599
$1.7M
gevent
1,637
585
$13M
Reactor Netty
1,456
267
$3.3M
EventMachine
1,379
528
$597K
futures-rs
1,367
542
$1M
Reactor Core
1,339
300
$12M
libevent
1,268
287
$2.6M
PromiseKit
1,183
285
$332K
Atmosphere
1,082
201
$3.7M
async-graphql
1,028
373
$2.2M
Mio
981
388
$470K
Seastar
843
173
$4M
SwiftNIO
811
198
$5.8M
Cats Effect
800
254
$1.5M
userver
777
40
$18M
liburing
762
235
$2.2M
uvloop
740
292
$349K
Trio
666
233
$1.5M
Wangle
666
69
$1.2M
aiobotocore
585
219
$1.3M
Sogou C++ Workflow
497
54
$1.8M
Lwt
445
142
$1M
asgiref
413
184
$146K
ember-concurrency
389
127
$290K
AnyIO
386
170
$757K
co
367
193
$28K
Microsoft Visual Studio Threading
337
54
$1.9M
Mitt
336
125
$15K
Highland
322
147
$1.7M
Mutiny
297
64
$3.1M
Actix Net
288
119
$428K
luv
263
90
$718K
nio4r
253
115
$319K
Async Ruby
211
100
$393K
EventEmitter3
211
82
$44K
async-io
109
58
$101K
Polling
108
45
$169K
async-channel
103
49
$50K
HTTP Body
97
56
$81K
nest_asyncio
95
37
$9K
zen-observable
94
50
$49K
fastq
93
36
$48K
async-stream
82
43
$35K
Effection
74
31
$618K
ASAP
72
34
$640K
Netty Reactive Streams
65
29
$116K
Neo-Async
61
26
$1.1M
Vine
52
26
$55K
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