solana-sysvar is used at run time in 125 crates (of which 7 optionally). It is a direct run-time dependency in 18 crates. It's used only as a dev dependency in 18 crates (of which 4 directly).

Depender (with downloads and own rev deps) solana-sysvar version
549K 83 spl-token-2022 ^2.2.1
487K 384 spl-token ^2.2.0
409K 645 solana-program ^2.2.1
195K 2 spl-elgamal-registry ^2.2.1
185K 35 solana-program-runtime ^2.2.1
173K 120 solana-account-decoder =2.2.1
235K 91 solana-account optional ^2.2.1
47K 26 solana-stake-program =2.2.1
45K 22 solana-bpf-loader-program =2.2.1
43K 10 solana-system-program =2.2.1
17K 27 solana-cli-output =2.2.1
5.1K 3 litesvm ^2.2
1.4K 7 mollusk-svm ^2.2
1.4K 3 solana-cli =2.2.1
150 solana-hbase-writer =2.2.1
spherenet-program ^2.2.1
408K 5 spl-program-error dev ^2.2.1
141K 48 solana-message dev ^2.2.1
93K 3 solana-reserved-account-keys dev ^2.2.1
42K 5 solana-loader-v4-program dev =2.2.1
26K 8 solana-svm dev =2.2.1
12K 12 agave-reserved-account-keys dev ^2.2.1