solana-sysvar is used at run time in 93 crates (of which 6 optionally). It is a direct run-time dependency in 14 crates. It's used only as a dev dependency in 7 crates (of which 3 directly).

Depender (with downloads and own rev deps) solana-sysvar version
315K 597 solana-program ^2.2.1
143K 37 solana-program-runtime =2.2.1
137K 115 solana-account-decoder =2.2.1
162K 39 solana-account optional ^2.2.1
41K 28 solana-stake-program =2.2.1
39K 22 solana-bpf-loader-program =2.2.1
38K 10 solana-system-program =2.2.1
18K 27 solana-cli-output =2.2.1
2.4K 4 litesvm ^2.2
1.5K 2 solana-cli =2.2.1
1.2K 5 mollusk-svm ^2.2
370 solana-hbase-writer =2.2.1
278K 5 spl-program-error dev ^2.2.1
93K 42 solana-message dev ^2.2.1
71K 11 solana-reserved-account-keys dev ^2.2.1
38K 5 solana-loader-v4-program dev =2.2.1
20K 10 solana-svm dev =2.2.1