SQL Databases
Space can be cleared from databases using the shrink database option
If desperate you can change the backup type of the database to "simple" then in the shrink files section select log file and then In Shrink action choose Reorganize pages before releasing unused space, set the desired size of the file and then click OK. After action is completed you can change backup to full and perform a backup as previous backups will not be ale to restore to the current state of the database.