A "leecher" in gaming is a player who sits out of confrontations to gain experience or loot from others' hard work.
If you are unsure of the source of leecher.zip , I recommend scanning it with a tool like VirusTotal before extracting it. If you intended to find a specific software review for a different "leecher" app (like a web-scraping tool), please provide a bit more detail!
In general computing, a "leecher" refers to a peer in a BitTorrent swarm.
It is highly regarded as a free, open-source tool for creators and viewers who need local copies of high-quality stream footage. 2. BitTorrent and Peer-to-Peer (P2P) Context