I recently used a Google Sheet with company name, date applied, status, action items, a link to the job description, etc. If I applied with a custom resume I add that to the same Google Drive folder with the appropriate name. Add color to the status column to make it a bit easier to scan. Move rejections to a new tab and keep post-mortem notes if you have any after phone screens/interviews (so you can study what you messed up on). It got the job done.