Hi there! I can't recommend third-party posting software as they often violate Facebook's terms of service and can lead to account restrictions or bans. Facebook actively detects automated posting tools and may suspend accounts using them.
Instead, try Facebook's official tools: use Creator Studio for scheduling posts across multiple pages, or Facebook Business Suite for managing posts efficiently. Go to Creator Studio → "Content Library" → schedule posts in advance legally and safely.
For group engagement, focus on organic participation - join relevant groups and contribute valuable content manually. This builds genuine relationships and avoids policy violations.
Check "Account Quality" in Ads Manager regularly to ensure your account stays in good standing.
What type of content are you looking to post in groups, and have you tried using Facebook's native scheduling tools in Creator Studio yet?