LuLu is an open source firewall tool for macOS。Can block outgoing network connections for any app，until you give us your permission。While LuLu is designed to detect malware generally by flagging unauthorized network connections，But it can also be used to prevent macOS components or third-party applications from transmitting information to remote servers。
feature
100% free
没有广告，no time trial，No missing features。
it doesn't track、监视或监视你——因为那只是纯粹的邪恶！
开源
LuLu 的完整源代码可在 GitHub 上找到。This transparency allows anyone to audit their code，or understand exactly what's going on。
保护
LuLu 旨在在尝试未经授权的网络连接时提醒您。therefore，It can often detect malware，or to block legitimate applications that may transmit private data to remote servers。
简单
“做一件事，Get it done! ” LuLu is designed to be as simple as possible。certainly，This means that complex features may not be available，但这也意味着它更易于使用并且攻击面更小！
企业友好
想知道检测到哪些网络事件？还是您的用户添加的规则？LuLu 提供了简单的机制来订阅此类事件，and open、Store data like rules in an easily digestible way。
网络监控
按照设计，LuLu only monitors outgoing network connections。Apple's built-in firewall does a great job of blocking unauthorized incoming connections。
规则
目前，LuLu only supports "process level" rules，This means that the process (or application) is either allowed to connect to the network，or be banned。As is the case with other firewalls，This also means that if malicious code abuses legitimate (allowed) processes to perform network operations，this will be allowed。
单用户
目前，LuLu can only be installed for a single user。A future version may allow multiple users to install it on the same system。
自我防备
合法的攻击者/安全专家知道，Any security tool that is specifically targeted，can be easily bypassed - even if the tool uses advanced self-defense mechanisms。This self-defense mechanism is often complex to implement，It's almost always in vain in the end。therefore，LuLu has (currently) few self-defense mechanisms implemented by design。For example，An attacker can enumerate all running processes to find the LuLu component responsible for displaying alerts and terminate it
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