Command line tool for signing Android ZIP/JAR/APK

 signapk is a command line tool for signing ZIP files, including JARs,
 APKs, and Over-The-Air (OTA) updates, in a way compatible with
 Android's mincrypt verifier, using EC or RSA keys and SHA1 or
 SHA-256. The tool can additionally sign APKs using APK Signature
 Scheme v2. It is the standard tool used to sign APK and JAR files
 distributed as part of Android ROMs.