Pakers/Unpakers
These are tools that are capable of unpaking or creating pak archives
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QuickBMS by Luigi Auriemma and unrealtournament.bms allow for fast unpaking of pak files
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unrealpak scripts by Fluffyquack which allows creation of compressed pak files
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u4pak by panzi which can also mount, list and check pak files
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rust-u4pak by panzi which is an alternate version which doesn't require installing python as it is written in rust
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ue4pak by Vilsol which also allows outputting the class trees of pak files